rebase: bump github.com/kubernetes-csi/external-snapshotter/client/v6

Bumps [github.com/kubernetes-csi/external-snapshotter/client/v6](https://github.com/kubernetes-csi/external-snapshotter) from 6.1.0 to 6.2.0.
- [Release notes](https://github.com/kubernetes-csi/external-snapshotter/releases)
- [Commits](https://github.com/kubernetes-csi/external-snapshotter/compare/v6.1.0...v6.2.0)

---
updated-dependencies:
- dependency-name: github.com/kubernetes-csi/external-snapshotter/client/v6
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -20,7 +20,7 @@ require (
 	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0
 	github.com/hashicorp/vault/api v1.8.2
 	github.com/kubernetes-csi/csi-lib-utils v0.11.0
-	github.com/kubernetes-csi/external-snapshotter/client/v6 v6.1.0
+	github.com/kubernetes-csi/external-snapshotter/client/v6 v6.2.0
 	github.com/libopenstorage/secrets v0.0.0-20210908194121-a1d19aa9713a
 	github.com/onsi/ginkgo/v2 v2.4.0
 	github.com/onsi/gomega v1.23.0
@@ -32,8 +32,8 @@ require (
 	golang.org/x/sys v0.4.0
 	google.golang.org/grpc v1.51.0
 	google.golang.org/protobuf v1.28.1
-	k8s.io/api v0.25.4
+	k8s.io/api v0.26.0
-	k8s.io/apimachinery v0.25.4
+	k8s.io/apimachinery v0.26.0
 	k8s.io/client-go v12.0.0+incompatible
 	k8s.io/cloud-provider v0.25.4
 	k8s.io/klog/v2 v2.80.1
@@ -163,7 +163,7 @@ require (
 	k8s.io/apiserver v0.25.4 // indirect
 	k8s.io/component-base v0.25.4 // indirect
 	k8s.io/component-helpers v0.25.4 // indirect
-	k8s.io/kube-openapi v0.0.0-20220803164354-a70c9af30aea // indirect
+	k8s.io/kube-openapi v0.0.0-20221012153701-172d655c2280 // indirect
 	k8s.io/kubectl v0.0.0 // indirect
 	k8s.io/kubelet v0.0.0 // indirect
 	sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.33 // indirect

go.sum

@@ -737,8 +737,8 @@ github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/kubernetes-csi/csi-lib-utils v0.11.0 h1:FHWOBtAZBA/hVk7v/qaXgG9Sxv0/n06DebPFuDwumqg=
 github.com/kubernetes-csi/csi-lib-utils v0.11.0/go.mod h1:BmGZZB16L18+9+Lgg9YWwBKfNEHIDdgGfAyuW6p2NV0=
 github.com/kubernetes-csi/external-snapshotter/client/v4 v4.0.0/go.mod h1:YBCo4DoEeDndqvAn6eeu0vWM7QdXmHEeI9cFWplmBys=
-github.com/kubernetes-csi/external-snapshotter/client/v6 v6.1.0 h1:yeuon3bOuOADwiWl2CyYrU4vbmYbAzGLCTscE1yLNHk=
+github.com/kubernetes-csi/external-snapshotter/client/v6 v6.2.0 h1:cMM5AB37e9aRGjErygVT6EuBPB6s5a+l95OPERmSlVM=
-github.com/kubernetes-csi/external-snapshotter/client/v6 v6.1.0/go.mod h1:eVY6gNtSrhsblGAqKFDG3CrkCLFAjsDvOpPpt+EaS6k=
+github.com/kubernetes-csi/external-snapshotter/client/v6 v6.2.0/go.mod h1:VQVLCPGDX5l6V5PezjlDXLa+SpCbWSVU7B16cFWVVeE=
 github.com/layeh/radius v0.0.0-20190322222518-890bc1058917/go.mod h1:fywZKyu//X7iRzaxLgPWsvc0L26IUpVvE/aeIL2JtIQ=
 github.com/lib/pq v1.2.0 h1:LXpIM/LZ5xGFhOpXAQUIMM1HdyqzVYM13zNdjCEEcA0=
 github.com/lib/pq v1.2.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
@@ -1726,8 +1726,8 @@ k8s.io/klog/v2 v2.80.1 h1:atnLQ121W371wYYFawwYx1aEY2eUfs4l3J72wtgAwV4=
 k8s.io/klog/v2 v2.80.1/go.mod h1:y1WjHnz7Dj687irZUWR/WLkLc5N1YHtjLdmgWjndZn0=
 k8s.io/kube-openapi v0.0.0-20180731170545-e3762e86a74c/go.mod h1:BXM9ceUBTj2QnfH2MK1odQs778ajze1RxcmP6S8RVVc=
 k8s.io/kube-openapi v0.0.0-20220803162953-67bda5d908f1/go.mod h1:C/N6wCaBHeBHkHUesQOQy2/MZqGgMAFPqGsGQLdbZBU=
-k8s.io/kube-openapi v0.0.0-20220803164354-a70c9af30aea h1:3QOH5+2fGsY8e1qf+GIFpg+zw/JGNrgyZRQR7/m6uWg=
+k8s.io/kube-openapi v0.0.0-20221012153701-172d655c2280 h1:+70TFaan3hfJzs+7VK2o+OGxg8HsuBr/5f6tVAjDu6E=
-k8s.io/kube-openapi v0.0.0-20220803164354-a70c9af30aea/go.mod h1:C/N6wCaBHeBHkHUesQOQy2/MZqGgMAFPqGsGQLdbZBU=
+k8s.io/kube-openapi v0.0.0-20221012153701-172d655c2280/go.mod h1:+Axhij7bCpeqhklhUTe3xmOn6bWxolyZEeyaFpjGtl4=
 k8s.io/kubectl v0.25.4 h1:O3OA1z4V1ZyvxCvScjq0pxAP7ABgznr8UvnVObgI6Dc=
 k8s.io/kubectl v0.25.4/go.mod h1:CKMrQ67Bn2YCP26tZStPQGq62zr9pvzEf65A0navm8k=
 k8s.io/kubelet v0.25.4 h1:24MmTTQGBHr08UkMYFC/RaLjuiMREM53HfRgJKWRquI=

vendor/k8s.io/kube-openapi/pkg/internal/flags.go

@@ -0,0 +1,20 @@
+/*
+Copyright 2022 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package internal
+
+// Used by tests to selectively disable experimental JSON unmarshaler
+var UseOptimizedJSONUnmarshaling bool = true

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/AUTHORS

@@ -0,0 +1,3 @@
+# This source code refers to The Go Authors for copyright purposes.
+# The master list of authors is in the main Go distribution,
+# visible at https://tip.golang.org/AUTHORS.

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/CONTRIBUTORS

@@ -0,0 +1,3 @@
+# This source code was written by the Go contributors.
+# The master list of contributors is in the main Go distribution,
+# visible at https://tip.golang.org/CONTRIBUTORS.

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2020 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/README.md

@@ -0,0 +1,321 @@
+# JSON Serialization (v2)
+
+[![GoDev](https://img.shields.io/static/v1?label=godev&message=reference&color=00add8)](https://pkg.go.dev/github.com/go-json-experiment/json)
+[![Build Status](https://github.com/go-json-experiment/json/actions/workflows/test.yml/badge.svg?branch=master)](https://github.com/go-json-experiment/json/actions)
+
+This module hosts an experimental implementation of v2 `encoding/json`.
+The API is unstable and breaking changes will regularly be made.
+Do not depend on this in publicly available modules.
+
+## Goals and objectives
+
+* **Mostly backwards compatible:** If possible, v2 should aim to be _mostly_
+compatible with v1 in terms of both API and default behavior to ease migration.
+For example, the `Marshal` and `Unmarshal` functions are the most widely used
+declarations in the v1 package. It seems sensible for equivalent functionality
+in v2 to be named the same and have the same signature.
+Behaviorally, we should aim for 95% to 99% backwards compatibility.
+We do not aim for 100% compatibility since we want the freedom to break
+certain behaviors that are now considered to have been a mistake.
+We may provide options that can bring the v2 implementation to 100% compatibility,
+but it will not be the default.
+
+* **More flexible:** There is a
+[long list of feature requests](https://github.com/golang/go/issues?q=is%3Aissue+is%3Aopen+encoding%2Fjson+in%3Atitle).
+We should aim to provide the most flexible features that addresses most usages.
+We do not want to over fit the v2 API to handle every possible use case.
+Ideally, the features provided should be orthogonal in nature such that
+any combination of features results in as few surprising edge cases as possible.
+
+* **More performant:** JSON serialization is widely used and any bit of extra
+performance gains will be greatly appreciated. Some rarely used behaviors of v1
+may be dropped in favor of better performance. For example,
+despite `Encoder` and `Decoder` operating on an `io.Writer` and `io.Reader`,
+they do not operate in a truly streaming manner,
+leading to a loss in performance. The v2 implementation should aim to be truly
+streaming by default (see [#33714](https://golang.org/issue/33714)).
+
+* **Easy to use (hard to misuse):** The v2 API should aim to make
+the common case easy and the less common case at least possible.
+The API should avoid behavior that goes contrary to user expectation,
+which may result in subtle bugs (see [#36225](https://golang.org/issue/36225)).
+
+* **v1 and v2 maintainability:** Since the v1 implementation must stay forever,
+it would be beneficial if v1 could be implemented under the hood with v2,
+allowing for less maintenance burden in the future. This probably implies that
+behavioral changes in v2 relative to v1 need to be exposed as options.
+
+* **Avoid unsafe:** Standard library packages generally avoid the use of
+package `unsafe` even if it could provide a performance boost.
+We aim to preserve this property.
+
+## Expectations
+
+While this module aims to possibly be the v2 implementation of `encoding/json`,
+there is no guarantee that this outcome will occur. As with any major change
+to the Go standard library, this will eventually go through the
+[Go proposal process](https://github.com/golang/proposal#readme).
+At the present moment, this is still in the design and experimentation phase
+and is not ready for a formal proposal.
+
+There are several possible outcomes from this experiment:
+1. We determine that a v2 `encoding/json` would not provide sufficient benefit
+over the existing v1 `encoding/json` package. Thus, we abandon this effort.
+2. We propose a v2 `encoding/json` design, but it is rejected in favor of some
+other design that is considered superior.
+3. We propose a v2 `encoding/json` design, but rather than adding an entirely
+new v2 `encoding/json` package, we decide to merge its functionality into
+the existing v1 `encoding/json` package.
+4. We propose a v2 `encoding/json` design and it is accepted, resulting in
+its addition to the standard library.
+5. Some other unforeseen outcome (among the infinite number of possibilities).
+
+## Development
+
+This module is primarily developed by
+[@dsnet](https://github.com/dsnet),
+[@mvdan](https://github.com/mvdan), and
+[@johanbrandhorst](https://github.com/johanbrandhorst)
+with feedback provided by
+[@rogpeppe](https://github.com/rogpeppe),
+[@ChrisHines](https://github.com/ChrisHines), and
+[@rsc](https://github.com/rsc).
+
+Discussion about semantics occur semi-regularly, where a
+[record of past meetings can be found here](https://docs.google.com/document/d/1rovrOTd-wTawGMPPlPuKhwXaYBg9VszTXR9AQQL5LfI/edit?usp=sharing).
+
+## Design overview
+
+This package aims to provide a clean separation between syntax and semantics.
+Syntax deals with the structural representation of JSON (as specified in
+[RFC 4627](https://tools.ietf.org/html/rfc4627),
+[RFC 7159](https://tools.ietf.org/html/rfc7159),
+[RFC 7493](https://tools.ietf.org/html/rfc7493),
+[RFC 8259](https://tools.ietf.org/html/rfc8259), and
+[RFC 8785](https://tools.ietf.org/html/rfc8785)).
+Semantics deals with the meaning of syntactic data as usable application data.
+
+The `Encoder` and `Decoder` types are streaming tokenizers concerned with the
+packing or parsing of JSON data. They operate on `Token` and `RawValue` types
+which represent the common data structures that are representable in JSON.
+`Encoder` and `Decoder` do not aim to provide any interpretation of the data.
+
+Functions like `Marshal`, `MarshalFull`, `MarshalNext`, `Unmarshal`,
+`UnmarshalFull`, and `UnmarshalNext` provide semantic meaning by correlating
+any arbitrary Go type with some JSON representation of that type (as stored in
+data types like `[]byte`, `io.Writer`, `io.Reader`, `Encoder`, or `Decoder`).
+
+![API overview](api.png)
+
+This diagram provides a high-level overview of the v2 `json` package.
+Purple blocks represent types, while blue blocks represent functions or methods.
+The arrows and their direction represent the approximate flow of data.
+The bottom half of the diagram contains functionality that is only concerned
+with syntax, while the upper half contains functionality that assigns
+semantic meaning to syntactic data handled by the bottom half.
+
+In contrast to v1 `encoding/json`, options are represented as separate types
+rather than being setter methods on the `Encoder` or `Decoder` types.
+
+## Behavior changes
+
+The v2 `json` package changes the default behavior of `Marshal` and `Unmarshal`
+relative to the v1 `json` package to be more sensible.
+Some of these behavior changes have options and workarounds to opt into
+behavior similar to what v1 provided.
+
+This table shows an overview of the changes:
+
+| v1 | v2 | Details |
+| -- | -- | ------- |
+| JSON object members are unmarshaled into a Go struct using a **case-insensitive name match**. | JSON object members are unmarshaled into a Go struct using a **case-sensitive name match**. | [CaseSensitivity](/diff_test.go#:~:text=TestCaseSensitivity) |
+| When marshaling a Go struct, a struct field marked as `omitempty` is omitted if **the field value is an empty Go value**, which is defined as false, 0, a nil pointer, a nil interface value, and any empty array, slice, map, or string. | When marshaling a Go struct, a struct field marked as `omitempty` is omitted if **the field value would encode as an empty JSON value**, which is defined as a JSON null, or an empty JSON string, object, or array. | [OmitEmptyOption](/diff_test.go#:~:text=TestOmitEmptyOption) |
+| The `string` option **does affect** Go bools. | The `string` option **does not affect** Go bools. | [StringOption](/diff_test.go#:~:text=TestStringOption) |
+| The `string` option **does not recursively affect** sub-values of the Go field value. | The `string` option **does recursively affect** sub-values of the Go field value. | [StringOption](/diff_test.go#:~:text=TestStringOption) |
+| The `string` option **sometimes accepts** a JSON null escaped within a JSON string. | The `string` option **never accepts** a JSON null escaped within a JSON string. | [StringOption](/diff_test.go#:~:text=TestStringOption) |
+| A nil Go slice is marshaled as a **JSON null**. | A nil Go slice is marshaled as an **empty JSON array**. | [NilSlicesAndMaps](/diff_test.go#:~:text=TestNilSlicesAndMaps) |
+| A nil Go map is marshaled as a **JSON null**. | A nil Go map is marshaled as an **empty JSON object**. | [NilSlicesAndMaps](/diff_test.go#:~:text=TestNilSlicesAndMaps) |
+| A Go array may be unmarshaled from a **JSON array of any length**. | A Go array must be unmarshaled from a **JSON array of the same length**. | [Arrays](/diff_test.go#:~:text=Arrays) |
+| A Go byte array is represented as a **JSON array of JSON numbers**. | A Go byte array is represented as a **Base64-encoded JSON string**. | [ByteArrays](/diff_test.go#:~:text=TestByteArrays) |
+| `MarshalJSON` and `UnmarshalJSON` methods declared on a pointer receiver are **inconsistently called**. | `MarshalJSON` and `UnmarshalJSON` methods declared on a pointer receiver are **consistently called**. | [PointerReceiver](/diff_test.go#:~:text=TestPointerReceiver) |
+| A Go map is marshaled in a **deterministic order**. | A Go map is marshaled in a **non-deterministic order**. | [MapDeterminism](/diff_test.go#:~:text=TestMapDeterminism) |
+| JSON strings are encoded **with HTML-specific characters being escaped**. | JSON strings are encoded **without any characters being escaped** (unless necessary). | [EscapeHTML](/diff_test.go#:~:text=TestEscapeHTML) |
+| When marshaling, invalid UTF-8 within a Go string **are silently replaced**. | When marshaling, invalid UTF-8 within a Go string **results in an error**. | [InvalidUTF8](/diff_test.go#:~:text=TestInvalidUTF8) |
+| When unmarshaling, invalid UTF-8 within a JSON string **are silently replaced**. | When unmarshaling, invalid UTF-8 within a JSON string **results in an error**. | [InvalidUTF8](/diff_test.go#:~:text=TestInvalidUTF8) |
+| When marshaling, **an error does not occur** if the output JSON value contains objects with duplicate names. | When marshaling, **an error does occur** if the output JSON value contains objects with duplicate names. | [DuplicateNames](/diff_test.go#:~:text=TestDuplicateNames) |
+| When unmarshaling, **an error does not occur** if the input JSON value contains objects with duplicate names. | When unmarshaling, **an error does occur** if the input JSON value contains objects with duplicate names. | [DuplicateNames](/diff_test.go#:~:text=TestDuplicateNames) |
+| Unmarshaling a JSON null into a non-empty Go value **inconsistently clears the value or does nothing**. | Unmarshaling a JSON null into a non-empty Go value **always clears the value**. | [MergeNull](/diff_test.go#:~:text=TestMergeNull) |
+| Unmarshaling a JSON value into a non-empty Go value **follows inconsistent and bizarre behavior**. | Unmarshaling a JSON value into a non-empty Go value **always merges if the input is an object, and otherwise replaces**.  | [MergeComposite](/diff_test.go#:~:text=TestMergeComposite) |
+| A `time.Duration` is represented as a **JSON number containing the decimal number of nanoseconds**. | A `time.Duration` is represented as a **JSON string containing the formatted duration (e.g., "1h2m3.456s")**. | [TimeDurations](/diff_test.go#:~:text=TestTimeDurations) |
+| Unmarshaling a JSON number into a Go float beyond its representation **results in an error**. | Unmarshaling a JSON number into a Go float beyond its representation **uses the closest representable value (e.g., ±`math.MaxFloat`)**. | [MaxFloats](/diff_test.go#:~:text=TestMaxFloats) |
+| A Go struct with only unexported fields **can be serialized**. | A Go struct with only unexported fields **cannot be serialized**. | [EmptyStructs](/diff_test.go#:~:text=TestEmptyStructs) |
+| A Go struct that embeds an unexported struct type **can sometimes be serialized**. | A Go struct that embeds an unexported struct type **cannot be serialized**. | [EmbedUnexported](/diff_test.go#:~:text=TestEmbedUnexported) |
+
+See [diff_test.go](/diff_test.go) for details about every change.
+
+## Performance
+
+One of the goals of the v2 module is to be more performant than v1.
+
+Each of the charts below show the performance across
+several different JSON implementations:
+
+* `JSONv1` is `encoding/json` at `v1.18.2`
+* `JSONv2` is `github.com/go-json-experiment/json` at `v0.0.0-20220524042235-dd8be80fc4a7`
+* `JSONIterator` is `github.com/json-iterator/go` at `v1.1.12`
+* `SegmentJSON` is `github.com/segmentio/encoding/json` at `v0.3.5`
+* `GoJSON` is `github.com/goccy/go-json` at `v0.9.7`
+* `SonicJSON` is `github.com/bytedance/sonic` at `v1.3.0`
+
+Benchmarks were run across various datasets:
+
+* `CanadaGeometry` is a GeoJSON (RFC 7946) representation of Canada.
+  It contains many JSON arrays of arrays of two-element arrays of numbers.
+* `CITMCatalog` contains many JSON objects using numeric names.
+* `SyntheaFHIR` is sample JSON data from the healthcare industry.
+  It contains many nested JSON objects with mostly string values,
+  where the set of unique string values is relatively small.
+* `TwitterStatus` is the JSON response from the Twitter API.
+  It contains a mix of all different JSON kinds, where string values
+  are a mix of both single-byte ASCII and multi-byte Unicode.
+* `GolangSource` is a simple tree representing the Go source code.
+  It contains many nested JSON objects, each with the same schema.
+* `StringUnicode` contains many strings with multi-byte Unicode runes.
+
+All of the implementations other than `JSONv1` and `JSONv2` make
+extensive use of `unsafe`. As such, we expect those to generally be faster,
+but at the cost of memory and type safety. `SonicJSON` goes a step even further
+and uses just-in-time compilation to generate machine code specialized
+for the Go type being marshaled or unmarshaled.
+Also, `SonicJSON` does not validate JSON strings for valid UTF-8,
+and so gains a notable performance boost on datasets with multi-byte Unicode.
+Benchmarks are performed based on the default marshal and unmarshal behavior
+of each package. Note that `JSONv2` aims to be safe and correct by default,
+which may not be the most performant strategy.
+
+`JSONv2` has several semantic changes relative to `JSONv1` that
+impacts performance:
+
+1.  When marshaling, `JSONv2` no longer sorts the keys of a Go map.
+    This will improve performance.
+2.  When marshaling or unmarshaling, `JSONv2` always checks
+    to make sure JSON object names are unique.
+    This will hurt performance, but is more correct.
+3.  When marshaling or unmarshaling, `JSONv2` always
+    shallow copies the underlying value for a Go interface and
+    shallow copies the key and value for entries in a Go map.
+    This is done to keep the value as addressable so that `JSONv2` can
+    call methods and functions that operate on a pointer receiver.
+    This will hurt performance, but is more correct.
+
+All of the charts are unit-less since the values are normalized
+relative to `JSONv1`, which is why `JSONv1` always has a value of 1.
+A lower value is better (i.e., runs faster).
+
+Benchmarks were performed on an AMD Ryzen 9 5900X.
+
+The code for the benchmarks is located at
+https://github.com/go-json-experiment/jsonbench.
+
+### Marshal Performance
+
+#### Concrete types
+
+![Benchmark Marshal Concrete](benchmark-marshal-concrete.png)
+
+* This compares marshal performance when serializing
+  [from concrete types](/testdata_test.go).
+* The `JSONv1` implementation is close to optimal (without the use of `unsafe`).
+* Relative to `JSONv1`, `JSONv2` is generally as fast or slightly faster.
+* Relative to `JSONIterator`, `JSONv2` is up to 1.3x faster.
+* Relative to `SegmentJSON`, `JSONv2` is up to 1.8x slower.
+* Relative to `GoJSON`, `JSONv2` is up to 2.0x slower.
+* Relative to `SonicJSON`, `JSONv2` is about 1.8x to 3.2x slower
+  (ignoring `StringUnicode` since `SonicJSON` does not validate UTF-8).
+* For `JSONv1` and `JSONv2`, marshaling from concrete types is
+  mostly limited by the performance of Go reflection.
+
+#### Interface types
+
+![Benchmark Marshal Interface](benchmark-marshal-interface.png)
+
+* This compares marshal performance when serializing from
+  `any`, `map[string]any`, and `[]any` types.
+* Relative to `JSONv1`, `JSONv2` is about 1.5x to 4.2x faster.
+* Relative to `JSONIterator`, `JSONv2` is about 1.1x to 2.4x faster.
+* Relative to `SegmentJSON`, `JSONv2` is about 1.2x to 1.8x faster.
+* Relative to `GoJSON`, `JSONv2` is about 1.1x to 2.5x faster.
+* Relative to `SonicJSON`, `JSONv2` is up to 1.5x slower
+  (ignoring `StringUnicode` since `SonicJSON` does not validate UTF-8).
+* `JSONv2` is faster than the alternatives.
+  One advantange is because it does not sort the keys for a `map[string]any`,
+  while alternatives (except `SonicJSON` and `JSONIterator`) do sort the keys.
+
+#### RawValue types
+
+![Benchmark Marshal Rawvalue](benchmark-marshal-rawvalue.png)
+
+* This compares performance when marshaling from a `json.RawValue`.
+  This mostly exercises the underlying encoder and
+  hides the cost of Go reflection.
+* Relative to `JSONv1`, `JSONv2` is about 3.5x to 7.8x faster.
+* `JSONIterator` is blazingly fast because
+  [it does not validate whether the raw value is valid](https://go.dev/play/p/bun9IXQCKRe)
+  and simply copies it to the output.
+* Relative to `SegmentJSON`, `JSONv2` is about 1.5x to 2.7x faster.
+* Relative to `GoJSON`, `JSONv2` is up to 2.2x faster.
+* Relative to `SonicJSON`, `JSONv2` is up to 1.5x faster.
+* Aside from `JSONIterator`, `JSONv2` is generally the fastest.
+
+### Unmarshal Performance
+
+#### Concrete types
+
+![Benchmark Unmarshal Concrete](benchmark-unmarshal-concrete.png)
+
+* This compares unmarshal performance when deserializing
+  [into concrete types](/testdata_test.go).
+* Relative to `JSONv1`, `JSONv2` is about 1.8x to 5.7x faster.
+* Relative to `JSONIterator`, `JSONv2` is about 1.1x to 1.6x slower.
+* Relative to `SegmentJSON`, `JSONv2` is up to 2.5x slower.
+* Relative to `GoJSON`, `JSONv2` is about 1.4x to 2.1x slower.
+* Relative to `SonicJSON`, `JSONv2` is up to 4.0x slower
+  (ignoring `StringUnicode` since `SonicJSON` does not validate UTF-8).
+* For `JSONv1` and `JSONv2`, unmarshaling into concrete types is
+  mostly limited by the performance of Go reflection.
+
+#### Interface types
+
+![Benchmark Unmarshal Interface](benchmark-unmarshal-interface.png)
+
+* This compares unmarshal performance when deserializing into
+  `any`, `map[string]any`, and `[]any` types.
+* Relative to `JSONv1`, `JSONv2` is about 1.tx to 4.3x faster.
+* Relative to `JSONIterator`, `JSONv2` is up to 1.5x faster.
+* Relative to `SegmentJSON`, `JSONv2` is about 1.5 to 3.7x faster.
+* Relative to `GoJSON`, `JSONv2` is up to 1.3x faster.
+* Relative to `SonicJSON`, `JSONv2` is up to 1.5x slower
+  (ignoring `StringUnicode` since `SonicJSON` does not validate UTF-8).
+* Aside from `SonicJSON`, `JSONv2` is generally just as fast
+  or faster than all the alternatives.
+
+#### RawValue types
+
+![Benchmark Unmarshal Rawvalue](benchmark-unmarshal-rawvalue.png)
+
+* This compares performance when unmarshaling into a `json.RawValue`.
+  This mostly exercises the underlying decoder and
+  hides away most of the cost of Go reflection.
+* Relative to `JSONv1`, `JSONv2` is about 8.3x to 17.0x faster.
+* Relative to `JSONIterator`, `JSONv2` is up to 2.0x faster.
+* Relative to `SegmentJSON`, `JSONv2` is up to 1.6x faster or 1.7x slower.
+* Relative to `GoJSON`, `JSONv2` is up to 1.9x faster or 2.1x slower.
+* Relative to `SonicJSON`, `JSONv2` is up to 2.0x faster
+  (ignoring `StringUnicode` since `SonicJSON` does not validate UTF-8).
+* `JSONv1` takes a
+  [lexical scanning approach](https://talks.golang.org/2011/lex.slide#1),
+  which performs a virtual function call for every byte of input.
+  In contrast, `JSONv2` makes heavy use of iterative and linear parsing logic
+  (with extra complexity to resume parsing when encountering segmented buffers).
+* `JSONv2` is comparable to the alternatives that use `unsafe`.
+  Generally it is faster, but sometimes it is slower.

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/arshal.go

@@ -0,0 +1,506 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"errors"
+	"io"
+	"reflect"
+	"sync"
+)
+
+// MarshalOptions configures how Go data is serialized as JSON data.
+// The zero value is equivalent to the default marshal settings.
+type MarshalOptions struct {
+	requireKeyedLiterals
+	nonComparable
+
+	// Marshalers is a list of type-specific marshalers to use.
+	Marshalers *Marshalers
+
+	// StringifyNumbers specifies that numeric Go types should be serialized
+	// as a JSON string containing the equivalent JSON number value.
+	//
+	// According to RFC 8259, section 6, a JSON implementation may choose to
+	// limit the representation of a JSON number to an IEEE 754 binary64 value.
+	// This may cause decoders to lose precision for int64 and uint64 types.
+	// Escaping JSON numbers as a JSON string preserves the exact precision.
+	StringifyNumbers bool
+
+	// DiscardUnknownMembers specifies that marshaling should ignore any
+	// JSON object members stored in Go struct fields dedicated to storing
+	// unknown JSON object members.
+	DiscardUnknownMembers bool
+
+	// formatDepth is the depth at which we respect the format flag.
+	formatDepth int
+	// format is custom formatting for the value at the specified depth.
+	format string
+}
+
+// Marshal serializes a Go value as a []byte with default options.
+// It is a thin wrapper over MarshalOptions.Marshal.
+func Marshal(in any) (out []byte, err error) {
+	return MarshalOptions{}.Marshal(EncodeOptions{}, in)
+}
+
+// MarshalFull serializes a Go value into an io.Writer with default options.
+// It is a thin wrapper over MarshalOptions.MarshalFull.
+func MarshalFull(out io.Writer, in any) error {
+	return MarshalOptions{}.MarshalFull(EncodeOptions{}, out, in)
+}
+
+// Marshal serializes a Go value as a []byte according to the provided
+// marshal and encode options. It does not terminate the output with a newline.
+// See MarshalNext for details about the conversion of a Go value into JSON.
+func (mo MarshalOptions) Marshal(eo EncodeOptions, in any) (out []byte, err error) {
+	enc := getBufferedEncoder(eo)
+	defer putBufferedEncoder(enc)
+	enc.options.omitTopLevelNewline = true
+	err = mo.MarshalNext(enc, in)
+	// TODO(https://go.dev/issue/45038): Use bytes.Clone.
+	return append([]byte(nil), enc.buf...), err
+}
+
+// MarshalFull serializes a Go value into an io.Writer according to the provided
+// marshal and encode options. It does not terminate the output with a newline.
+// See MarshalNext for details about the conversion of a Go value into JSON.
+func (mo MarshalOptions) MarshalFull(eo EncodeOptions, out io.Writer, in any) error {
+	enc := getStreamingEncoder(out, eo)
+	defer putStreamingEncoder(enc)
+	enc.options.omitTopLevelNewline = true
+	err := mo.MarshalNext(enc, in)
+	return err
+}
+
+// MarshalNext encodes a Go value as the next JSON value according to
+// the provided marshal options.
+//
+// Type-specific marshal functions and methods take precedence
+// over the default representation of a value.
+// Functions or methods that operate on *T are only called when encoding
+// a value of type T (by taking its address) or a non-nil value of *T.
+// MarshalNext ensures that a value is always addressable
+// (by boxing it on the heap if necessary) so that
+// these functions and methods can be consistently called. For performance,
+// it is recommended that MarshalNext be passed a non-nil pointer to the value.
+//
+// The input value is encoded as JSON according the following rules:
+//
+//   - If any type-specific functions in MarshalOptions.Marshalers match
+//     the value type, then those functions are called to encode the value.
+//     If all applicable functions return SkipFunc,
+//     then the value is encoded according to subsequent rules.
+//
+//   - If the value type implements MarshalerV2,
+//     then the MarshalNextJSON method is called to encode the value.
+//
+//   - If the value type implements MarshalerV1,
+//     then the MarshalJSON method is called to encode the value.
+//
+//   - If the value type implements encoding.TextMarshaler,
+//     then the MarshalText method is called to encode the value and
+//     subsequently encode its result as a JSON string.
+//
+//   - Otherwise, the value is encoded according to the value's type
+//     as described in detail below.
+//
+// Most Go types have a default JSON representation.
+// Certain types support specialized formatting according to
+// a format flag optionally specified in the Go struct tag
+// for the struct field that contains the current value
+// (see the “JSON Representation of Go structs” section for more details).
+//
+// The representation of each type is as follows:
+//
+//   - A Go boolean is encoded as a JSON boolean (e.g., true or false).
+//     It does not support any custom format flags.
+//
+//   - A Go string is encoded as a JSON string.
+//     It does not support any custom format flags.
+//
+//   - A Go []byte or [N]byte is encoded as a JSON string containing
+//     the binary value encoded using RFC 4648.
+//     If the format is "base64" or unspecified, then this uses RFC 4648, section 4.
+//     If the format is "base64url", then this uses RFC 4648, section 5.
+//     If the format is "base32", then this uses RFC 4648, section 6.
+//     If the format is "base32hex", then this uses RFC 4648, section 7.
+//     If the format is "base16" or "hex", then this uses RFC 4648, section 8.
+//     If the format is "array", then the bytes value is encoded as a JSON array
+//     where each byte is recursively JSON-encoded as each JSON array element.
+//
+//   - A Go integer is encoded as a JSON number without fractions or exponents.
+//     If MarshalOptions.StringifyNumbers is specified, then the JSON number is
+//     encoded within a JSON string. It does not support any custom format
+//     flags.
+//
+//   - A Go float is encoded as a JSON number.
+//     If MarshalOptions.StringifyNumbers is specified,
+//     then the JSON number is encoded within a JSON string.
+//     If the format is "nonfinite", then NaN, +Inf, and -Inf are encoded as
+//     the JSON strings "NaN", "Infinity", and "-Infinity", respectively.
+//     Otherwise, the presence of non-finite numbers results in a SemanticError.
+//
+//   - A Go map is encoded as a JSON object, where each Go map key and value
+//     is recursively encoded as a name and value pair in the JSON object.
+//     The Go map key must encode as a JSON string, otherwise this results
+//     in a SemanticError. When encoding keys, MarshalOptions.StringifyNumbers
+//     is automatically applied so that numeric keys encode as JSON strings.
+//     The Go map is traversed in a non-deterministic order.
+//     For deterministic encoding, consider using RawValue.Canonicalize.
+//     If the format is "emitnull", then a nil map is encoded as a JSON null.
+//     Otherwise by default, a nil map is encoded as an empty JSON object.
+//
+//   - A Go struct is encoded as a JSON object.
+//     See the “JSON Representation of Go structs” section
+//     in the package-level documentation for more details.
+//
+//   - A Go slice is encoded as a JSON array, where each Go slice element
+//     is recursively JSON-encoded as the elements of the JSON array.
+//     If the format is "emitnull", then a nil slice is encoded as a JSON null.
+//     Otherwise by default, a nil slice is encoded as an empty JSON array.
+//
+//   - A Go array is encoded as a JSON array, where each Go array element
+//     is recursively JSON-encoded as the elements of the JSON array.
+//     The JSON array length is always identical to the Go array length.
+//     It does not support any custom format flags.
+//
+//   - A Go pointer is encoded as a JSON null if nil, otherwise it is
+//     the recursively JSON-encoded representation of the underlying value.
+//     Format flags are forwarded to the encoding of the underlying value.
+//
+//   - A Go interface is encoded as a JSON null if nil, otherwise it is
+//     the recursively JSON-encoded representation of the underlying value.
+//     It does not support any custom format flags.
+//
+//   - A Go time.Time is encoded as a JSON string containing the timestamp
+//     formatted in RFC 3339 with nanosecond resolution.
+//     If the format matches one of the format constants declared
+//     in the time package (e.g., RFC1123), then that format is used.
+//     Otherwise, the format is used as-is with time.Time.Format if non-empty.
+//
+//   - A Go time.Duration is encoded as a JSON string containing the duration
+//     formatted according to time.Duration.String.
+//     If the format is "nanos", it is encoded as a JSON number
+//     containing the number of nanoseconds in the duration.
+//
+//   - All other Go types (e.g., complex numbers, channels, and functions)
+//     have no default representation and result in a SemanticError.
+//
+// JSON cannot represent cyclic data structures and
+// MarshalNext does not handle them.
+// Passing cyclic structures will result in an error.
+func (mo MarshalOptions) MarshalNext(out *Encoder, in any) error {
+	v := reflect.ValueOf(in)
+	if !v.IsValid() || (v.Kind() == reflect.Pointer && v.IsNil()) {
+		return out.WriteToken(Null)
+	}
+	// Shallow copy non-pointer values to obtain an addressable value.
+	// It is beneficial to performance to always pass pointers to avoid this.
+	if v.Kind() != reflect.Pointer {
+		v2 := reflect.New(v.Type())
+		v2.Elem().Set(v)
+		v = v2
+	}
+	va := addressableValue{v.Elem()} // dereferenced pointer is always addressable
+	t := va.Type()
+
+	// Lookup and call the marshal function for this type.
+	marshal := lookupArshaler(t).marshal
+	if mo.Marshalers != nil {
+		marshal, _ = mo.Marshalers.lookup(marshal, t)
+	}
+	if err := marshal(mo, out, va); err != nil {
+		if !out.options.AllowDuplicateNames {
+			out.tokens.invalidateDisabledNamespaces()
+		}
+		return err
+	}
+	return nil
+}
+
+// UnmarshalOptions configures how JSON data is deserialized as Go data.
+// The zero value is equivalent to the default unmarshal settings.
+type UnmarshalOptions struct {
+	requireKeyedLiterals
+	nonComparable
+
+	// Unmarshalers is a list of type-specific unmarshalers to use.
+	Unmarshalers *Unmarshalers
+
+	// StringifyNumbers specifies that numeric Go types can be deserialized
+	// from either a JSON number or a JSON string containing a JSON number
+	// without any surrounding whitespace.
+	StringifyNumbers bool
+
+	// RejectUnknownMembers specifies that unknown members should be rejected
+	// when unmarshaling a JSON object, regardless of whether there is a field
+	// to store unknown members.
+	RejectUnknownMembers bool
+
+	// formatDepth is the depth at which we respect the format flag.
+	formatDepth int
+	// format is custom formatting for the value at the specified depth.
+	format string
+}
+
+// Unmarshal deserializes a Go value from a []byte with default options.
+// It is a thin wrapper over UnmarshalOptions.Unmarshal.
+func Unmarshal(in []byte, out any) error {
+	return UnmarshalOptions{}.Unmarshal(DecodeOptions{}, in, out)
+}
+
+// UnmarshalFull deserializes a Go value from an io.Reader with default options.
+// It is a thin wrapper over UnmarshalOptions.UnmarshalFull.
+func UnmarshalFull(in io.Reader, out any) error {
+	return UnmarshalOptions{}.UnmarshalFull(DecodeOptions{}, in, out)
+}
+
+// Unmarshal deserializes a Go value from a []byte according to the
+// provided unmarshal and decode options. The output must be a non-nil pointer.
+// The input must be a single JSON value with optional whitespace interspersed.
+// See UnmarshalNext for details about the conversion of JSON into a Go value.
+func (uo UnmarshalOptions) Unmarshal(do DecodeOptions, in []byte, out any) error {
+	dec := getBufferedDecoder(in, do)
+	defer putBufferedDecoder(dec)
+	return uo.unmarshalFull(dec, out)
+}
+
+// UnmarshalFull deserializes a Go value from an io.Reader according to the
+// provided unmarshal and decode options. The output must be a non-nil pointer.
+// The input must be a single JSON value with optional whitespace interspersed.
+// It consumes the entirety of io.Reader until io.EOF is encountered.
+// See UnmarshalNext for details about the conversion of JSON into a Go value.
+func (uo UnmarshalOptions) UnmarshalFull(do DecodeOptions, in io.Reader, out any) error {
+	dec := getStreamingDecoder(in, do)
+	defer putStreamingDecoder(dec)
+	return uo.unmarshalFull(dec, out)
+}
+func (uo UnmarshalOptions) unmarshalFull(in *Decoder, out any) error {
+	switch err := uo.UnmarshalNext(in, out); err {
+	case nil:
+		return in.checkEOF()
+	case io.EOF:
+		return io.ErrUnexpectedEOF
+	default:
+		return err
+	}
+}
+
+// UnmarshalNext decodes the next JSON value into a Go value according to
+// the provided unmarshal options. The output must be a non-nil pointer.
+//
+// Type-specific unmarshal functions and methods take precedence
+// over the default representation of a value.
+// Functions or methods that operate on *T are only called when decoding
+// a value of type T (by taking its address) or a non-nil value of *T.
+// UnmarshalNext ensures that a value is always addressable
+// (by boxing it on the heap if necessary) so that
+// these functions and methods can be consistently called.
+//
+// The input is decoded into the output according the following rules:
+//
+//   - If any type-specific functions in UnmarshalOptions.Unmarshalers match
+//     the value type, then those functions are called to decode the JSON
+//     value. If all applicable functions return SkipFunc,
+//     then the input is decoded according to subsequent rules.
+//
+//   - If the value type implements UnmarshalerV2,
+//     then the UnmarshalNextJSON method is called to decode the JSON value.
+//
+//   - If the value type implements UnmarshalerV1,
+//     then the UnmarshalJSON method is called to decode the JSON value.
+//
+//   - If the value type implements encoding.TextUnmarshaler,
+//     then the input is decoded as a JSON string and
+//     the UnmarshalText method is called with the decoded string value.
+//     This fails with a SemanticError if the input is not a JSON string.
+//
+//   - Otherwise, the JSON value is decoded according to the value's type
+//     as described in detail below.
+//
+// Most Go types have a default JSON representation.
+// Certain types support specialized formatting according to
+// a format flag optionally specified in the Go struct tag
+// for the struct field that contains the current value
+// (see the “JSON Representation of Go structs” section for more details).
+// A JSON null may be decoded into every supported Go value where
+// it is equivalent to storing the zero value of the Go value.
+// If the input JSON kind is not handled by the current Go value type,
+// then this fails with a SemanticError. Unless otherwise specified,
+// the decoded value replaces any pre-existing value.
+//
+// The representation of each type is as follows:
+//
+//   - A Go boolean is decoded from a JSON boolean (e.g., true or false).
+//     It does not support any custom format flags.
+//
+//   - A Go string is decoded from a JSON string.
+//     It does not support any custom format flags.
+//
+//   - A Go []byte or [N]byte is decoded from a JSON string
+//     containing the binary value encoded using RFC 4648.
+//     If the format is "base64" or unspecified, then this uses RFC 4648, section 4.
+//     If the format is "base64url", then this uses RFC 4648, section 5.
+//     If the format is "base32", then this uses RFC 4648, section 6.
+//     If the format is "base32hex", then this uses RFC 4648, section 7.
+//     If the format is "base16" or "hex", then this uses RFC 4648, section 8.
+//     If the format is "array", then the Go slice or array is decoded from a
+//     JSON array where each JSON element is recursively decoded for each byte.
+//     When decoding into a non-nil []byte, the slice length is reset to zero
+//     and the decoded input is appended to it.
+//     When decoding into a [N]byte, the input must decode to exactly N bytes,
+//     otherwise it fails with a SemanticError.
+//
+//   - A Go integer is decoded from a JSON number.
+//     It may also be decoded from a JSON string containing a JSON number
+//     if UnmarshalOptions.StringifyNumbers is specified.
+//     It fails with a SemanticError if the JSON number
+//     has a fractional or exponent component.
+//     It also fails if it overflows the representation of the Go integer type.
+//     It does not support any custom format flags.
+//
+//   - A Go float is decoded from a JSON number.
+//     It may also be decoded from a JSON string containing a JSON number
+//     if UnmarshalOptions.StringifyNumbers is specified.
+//     The JSON number is parsed as the closest representable Go float value.
+//     If the format is "nonfinite", then the JSON strings
+//     "NaN", "Infinity", and "-Infinity" are decoded as NaN, +Inf, and -Inf.
+//     Otherwise, the presence of such strings results in a SemanticError.
+//
+//   - A Go map is decoded from a JSON object,
+//     where each JSON object name and value pair is recursively decoded
+//     as the Go map key and value. When decoding keys,
+//     UnmarshalOptions.StringifyNumbers is automatically applied so that
+//     numeric keys can decode from JSON strings. Maps are not cleared.
+//     If the Go map is nil, then a new map is allocated to decode into.
+//     If the decoded key matches an existing Go map entry, the entry value
+//     is reused by decoding the JSON object value into it.
+//     The only supported format is "emitnull" and has no effect when decoding.
+//
+//   - A Go struct is decoded from a JSON object.
+//     See the “JSON Representation of Go structs” section
+//     in the package-level documentation for more details.
+//
+//   - A Go slice is decoded from a JSON array, where each JSON element
+//     is recursively decoded and appended to the Go slice.
+//     Before appending into a Go slice, a new slice is allocated if it is nil,
+//     otherwise the slice length is reset to zero.
+//     The only supported format is "emitnull" and has no effect when decoding.
+//
+//   - A Go array is decoded from a JSON array, where each JSON array element
+//     is recursively decoded as each corresponding Go array element.
+//     Each Go array element is zeroed before decoding into it.
+//     It fails with a SemanticError if the JSON array does not contain
+//     the exact same number of elements as the Go array.
+//     It does not support any custom format flags.
+//
+//   - A Go pointer is decoded based on the JSON kind and underlying Go type.
+//     If the input is a JSON null, then this stores a nil pointer.
+//     Otherwise, it allocates a new underlying value if the pointer is nil,
+//     and recursively JSON decodes into the underlying value.
+//     Format flags are forwarded to the decoding of the underlying type.
+//
+//   - A Go interface is decoded based on the JSON kind and underlying Go type.
+//     If the input is a JSON null, then this stores a nil interface value.
+//     Otherwise, a nil interface value of an empty interface type is initialized
+//     with a zero Go bool, string, float64, map[string]any, or []any if the
+//     input is a JSON boolean, string, number, object, or array, respectively.
+//     If the interface value is still nil, then this fails with a SemanticError
+//     since decoding could not determine an appropriate Go type to decode into.
+//     For example, unmarshaling into a nil io.Reader fails since
+//     there is no concrete type to populate the interface value with.
+//     Otherwise an underlying value exists and it recursively decodes
+//     the JSON input into it. It does not support any custom format flags.
+//
+//   - A Go time.Time is decoded from a JSON string containing the time
+//     formatted in RFC 3339 with nanosecond resolution.
+//     If the format matches one of the format constants declared in
+//     the time package (e.g., RFC1123), then that format is used for parsing.
+//     Otherwise, the format is used as-is with time.Time.Parse if non-empty.
+//
+//   - A Go time.Duration is decoded from a JSON string by
+//     passing the decoded string to time.ParseDuration.
+//     If the format is "nanos", it is instead decoded from a JSON number
+//     containing the number of nanoseconds in the duration.
+//
+//   - All other Go types (e.g., complex numbers, channels, and functions)
+//     have no default representation and result in a SemanticError.
+//
+// In general, unmarshaling follows merge semantics (similar to RFC 7396)
+// where the decoded Go value replaces the destination value
+// for any JSON kind other than an object.
+// For JSON objects, the input object is merged into the destination value
+// where matching object members recursively apply merge semantics.
+func (uo UnmarshalOptions) UnmarshalNext(in *Decoder, out any) error {
+	v := reflect.ValueOf(out)
+	if !v.IsValid() || v.Kind() != reflect.Pointer || v.IsNil() {
+		var t reflect.Type
+		if v.IsValid() {
+			t = v.Type()
+			if t.Kind() == reflect.Pointer {
+				t = t.Elem()
+			}
+		}
+		err := errors.New("value must be passed as a non-nil pointer reference")
+		return &SemanticError{action: "unmarshal", GoType: t, Err: err}
+	}
+	va := addressableValue{v.Elem()} // dereferenced pointer is always addressable
+	t := va.Type()
+
+	// Lookup and call the unmarshal function for this type.
+	unmarshal := lookupArshaler(t).unmarshal
+	if uo.Unmarshalers != nil {
+		unmarshal, _ = uo.Unmarshalers.lookup(unmarshal, t)
+	}
+	if err := unmarshal(uo, in, va); err != nil {
+		if !in.options.AllowDuplicateNames {
+			in.tokens.invalidateDisabledNamespaces()
+		}
+		return err
+	}
+	return nil
+}
+
+// addressableValue is a reflect.Value that is guaranteed to be addressable
+// such that calling the Addr and Set methods do not panic.
+//
+// There is no compile magic that enforces this property,
+// but rather the need to construct this type makes it easier to examine each
+// construction site to ensure that this property is upheld.
+type addressableValue struct{ reflect.Value }
+
+// newAddressableValue constructs a new addressable value of type t.
+func newAddressableValue(t reflect.Type) addressableValue {
+	return addressableValue{reflect.New(t).Elem()}
+}
+
+// All marshal and unmarshal behavior is implemented using these signatures.
+type (
+	marshaler   = func(MarshalOptions, *Encoder, addressableValue) error
+	unmarshaler = func(UnmarshalOptions, *Decoder, addressableValue) error
+)
+
+type arshaler struct {
+	marshal    marshaler
+	unmarshal  unmarshaler
+	nonDefault bool
+}
+
+var lookupArshalerCache sync.Map // map[reflect.Type]*arshaler
+
+func lookupArshaler(t reflect.Type) *arshaler {
+	if v, ok := lookupArshalerCache.Load(t); ok {
+		return v.(*arshaler)
+	}
+
+	fncs := makeDefaultArshaler(t)
+	fncs = makeMethodArshaler(fncs, t)
+	fncs = makeTimeArshaler(fncs, t)
+
+	// Use the last stored so that duplicate arshalers can be garbage collected.
+	v, _ := lookupArshalerCache.LoadOrStore(t, fncs)
+	return v.(*arshaler)
+}

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/arshal_any.go

@@ -0,0 +1,219 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import "reflect"
+
+// This files contains an optimized marshal and unmarshal implementation
+// for the any type. This type is often used when the Go program has
+// no knowledge of the JSON schema. This is a common enough occurrence
+// to justify the complexity of adding logic for this.
+
+func marshalValueAny(mo MarshalOptions, enc *Encoder, val any) error {
+	switch val := val.(type) {
+	case nil:
+		return enc.WriteToken(Null)
+	case bool:
+		return enc.WriteToken(Bool(val))
+	case string:
+		return enc.WriteToken(String(val))
+	case float64:
+		return enc.WriteToken(Float(val))
+	case map[string]any:
+		return marshalObjectAny(mo, enc, val)
+	case []any:
+		return marshalArrayAny(mo, enc, val)
+	default:
+		v := newAddressableValue(reflect.TypeOf(val))
+		v.Set(reflect.ValueOf(val))
+		marshal := lookupArshaler(v.Type()).marshal
+		if mo.Marshalers != nil {
+			marshal, _ = mo.Marshalers.lookup(marshal, v.Type())
+		}
+		return marshal(mo, enc, v)
+	}
+}
+
+func unmarshalValueAny(uo UnmarshalOptions, dec *Decoder) (any, error) {
+	switch k := dec.PeekKind(); k {
+	case '{':
+		return unmarshalObjectAny(uo, dec)
+	case '[':
+		return unmarshalArrayAny(uo, dec)
+	default:
+		var flags valueFlags
+		val, err := dec.readValue(&flags)
+		if err != nil {
+			return nil, err
+		}
+		switch val.Kind() {
+		case 'n':
+			return nil, nil
+		case 'f':
+			return false, nil
+		case 't':
+			return true, nil
+		case '"':
+			val = unescapeStringMayCopy(val, flags.isVerbatim())
+			if dec.stringCache == nil {
+				dec.stringCache = new(stringCache)
+			}
+			return dec.stringCache.make(val), nil
+		case '0':
+			fv, _ := parseFloat(val, 64) // ignore error since readValue gaurantees val is valid
+			return fv, nil
+		default:
+			panic("BUG: invalid kind: " + k.String())
+		}
+	}
+}
+
+func marshalObjectAny(mo MarshalOptions, enc *Encoder, obj map[string]any) error {
+	// Check for cycles.
+	if enc.tokens.depth() > startDetectingCyclesAfter {
+		v := reflect.ValueOf(obj)
+		if err := enc.seenPointers.visit(v); err != nil {
+			return err
+		}
+		defer enc.seenPointers.leave(v)
+	}
+
+	// Optimize for marshaling an empty map without any preceding whitespace.
+	if len(obj) == 0 && !enc.options.multiline && !enc.tokens.last.needObjectName() {
+		enc.buf = enc.tokens.mayAppendDelim(enc.buf, '{')
+		enc.buf = append(enc.buf, "{}"...)
+		enc.tokens.last.increment()
+		if enc.needFlush() {
+			return enc.flush()
+		}
+		return nil
+	}
+
+	if err := enc.WriteToken(ObjectStart); err != nil {
+		return err
+	}
+	// A Go map guarantees that each entry has a unique key
+	// The only possibility of duplicates is due to invalid UTF-8.
+	if !enc.options.AllowInvalidUTF8 {
+		enc.tokens.last.disableNamespace()
+	}
+	for name, val := range obj {
+		if err := enc.WriteToken(String(name)); err != nil {
+			return err
+		}
+		if err := marshalValueAny(mo, enc, val); err != nil {
+			return err
+		}
+	}
+	if err := enc.WriteToken(ObjectEnd); err != nil {
+		return err
+	}
+	return nil
+}
+
+func unmarshalObjectAny(uo UnmarshalOptions, dec *Decoder) (map[string]any, error) {
+	tok, err := dec.ReadToken()
+	if err != nil {
+		return nil, err
+	}
+	k := tok.Kind()
+	switch k {
+	case 'n':
+		return nil, nil
+	case '{':
+		obj := make(map[string]any)
+		// A Go map guarantees that each entry has a unique key
+		// The only possibility of duplicates is due to invalid UTF-8.
+		if !dec.options.AllowInvalidUTF8 {
+			dec.tokens.last.disableNamespace()
+		}
+		for dec.PeekKind() != '}' {
+			tok, err := dec.ReadToken()
+			if err != nil {
+				return obj, err
+			}
+			name := tok.String()
+
+			// Manually check for duplicate names.
+			if _, ok := obj[name]; ok {
+				name := dec.previousBuffer()
+				err := &SyntacticError{str: "duplicate name " + string(name) + " in object"}
+				return obj, err.withOffset(dec.InputOffset() - int64(len(name)))
+			}
+
+			val, err := unmarshalValueAny(uo, dec)
+			obj[name] = val
+			if err != nil {
+				return obj, err
+			}
+		}
+		if _, err := dec.ReadToken(); err != nil {
+			return obj, err
+		}
+		return obj, nil
+	}
+	return nil, &SemanticError{action: "unmarshal", JSONKind: k, GoType: mapStringAnyType}
+}
+
+func marshalArrayAny(mo MarshalOptions, enc *Encoder, arr []any) error {
+	// Check for cycles.
+	if enc.tokens.depth() > startDetectingCyclesAfter {
+		v := reflect.ValueOf(arr)
+		if err := enc.seenPointers.visit(v); err != nil {
+			return err
+		}
+		defer enc.seenPointers.leave(v)
+	}
+
+	// Optimize for marshaling an empty slice without any preceding whitespace.
+	if len(arr) == 0 && !enc.options.multiline && !enc.tokens.last.needObjectName() {
+		enc.buf = enc.tokens.mayAppendDelim(enc.buf, '[')
+		enc.buf = append(enc.buf, "[]"...)
+		enc.tokens.last.increment()
+		if enc.needFlush() {
+			return enc.flush()
+		}
+		return nil
+	}
+
+	if err := enc.WriteToken(ArrayStart); err != nil {
+		return err
+	}
+	for _, val := range arr {
+		if err := marshalValueAny(mo, enc, val); err != nil {
+			return err
+		}
+	}
+	if err := enc.WriteToken(ArrayEnd); err != nil {
+		return err
+	}
+	return nil
+}
+
+func unmarshalArrayAny(uo UnmarshalOptions, dec *Decoder) ([]any, error) {
+	tok, err := dec.ReadToken()
+	if err != nil {
+		return nil, err
+	}
+	k := tok.Kind()
+	switch k {
+	case 'n':
+		return nil, nil
+	case '[':
+		arr := []any{}
+		for dec.PeekKind() != ']' {
+			val, err := unmarshalValueAny(uo, dec)
+			arr = append(arr, val)
+			if err != nil {
+				return arr, err
+			}
+		}
+		if _, err := dec.ReadToken(); err != nil {
+			return arr, err
+		}
+		return arr, nil
+	}
+	return nil, &SemanticError{action: "unmarshal", JSONKind: k, GoType: sliceAnyType}
+}

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/arshal_funcs.go

@@ -0,0 +1,387 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"sync"
+)
+
+// SkipFunc may be returned by MarshalFuncV2 and UnmarshalFuncV2 functions.
+//
+// Any function that returns SkipFunc must not cause observable side effects
+// on the provided Encoder or Decoder. For example, it is permissible to call
+// Decoder.PeekKind, but not permissible to call Decoder.ReadToken or
+// Encoder.WriteToken since such methods mutate the state.
+const SkipFunc = jsonError("skip function")
+
+// Marshalers is a list of functions that may override the marshal behavior
+// of specific types. Populate MarshalOptions.Marshalers to use it.
+// A nil *Marshalers is equivalent to an empty list.
+type Marshalers = typedMarshalers
+
+// NewMarshalers constructs a flattened list of marshal functions.
+// If multiple functions in the list are applicable for a value of a given type,
+// then those earlier in the list take precedence over those that come later.
+// If a function returns SkipFunc, then the next applicable function is called,
+// otherwise the default marshaling behavior is used.
+//
+// For example:
+//
+//	m1 := NewMarshalers(f1, f2)
+//	m2 := NewMarshalers(f0, m1, f3)     // equivalent to m3
+//	m3 := NewMarshalers(f0, f1, f2, f3) // equivalent to m2
+func NewMarshalers(ms ...*Marshalers) *Marshalers {
+	return newMarshalers(ms...)
+}
+
+// Unmarshalers is a list of functions that may override the unmarshal behavior
+// of specific types. Populate UnmarshalOptions.Unmarshalers to use it.
+// A nil *Unmarshalers is equivalent to an empty list.
+type Unmarshalers = typedUnmarshalers
+
+// NewUnmarshalers constructs a flattened list of unmarshal functions.
+// If multiple functions in the list are applicable for a value of a given type,
+// then those earlier in the list take precedence over those that come later.
+// If a function returns SkipFunc, then the next applicable function is called,
+// otherwise the default unmarshaling behavior is used.
+//
+// For example:
+//
+//	u1 := NewUnmarshalers(f1, f2)
+//	u2 := NewUnmarshalers(f0, u1, f3)     // equivalent to u3
+//	u3 := NewUnmarshalers(f0, f1, f2, f3) // equivalent to u2
+func NewUnmarshalers(us ...*Unmarshalers) *Unmarshalers {
+	return newUnmarshalers(us...)
+}
+
+type typedMarshalers = typedArshalers[MarshalOptions, Encoder]
+type typedUnmarshalers = typedArshalers[UnmarshalOptions, Decoder]
+type typedArshalers[Options, Coder any] struct {
+	nonComparable
+
+	fncVals  []typedArshaler[Options, Coder]
+	fncCache sync.Map // map[reflect.Type]arshaler
+
+	// fromAny reports whether any of Go types used to represent arbitrary JSON
+	// (i.e., any, bool, string, float64, map[string]any, or []any) matches
+	// any of the provided type-specific arshalers.
+	//
+	// This bit of information is needed in arshal_default.go to determine
+	// whether to use the specialized logic in arshal_any.go to handle
+	// the any interface type. The logic in arshal_any.go does not support
+	// type-specific arshal functions, so we must avoid using that logic
+	// if this is true.
+	fromAny bool
+}
+type typedMarshaler = typedArshaler[MarshalOptions, Encoder]
+type typedUnmarshaler = typedArshaler[UnmarshalOptions, Decoder]
+type typedArshaler[Options, Coder any] struct {
+	typ     reflect.Type
+	fnc     func(Options, *Coder, addressableValue) error
+	maySkip bool
+}
+
+func newMarshalers(ms ...*Marshalers) *Marshalers       { return newTypedArshalers(ms...) }
+func newUnmarshalers(us ...*Unmarshalers) *Unmarshalers { return newTypedArshalers(us...) }
+func newTypedArshalers[Options, Coder any](as ...*typedArshalers[Options, Coder]) *typedArshalers[Options, Coder] {
+	var a typedArshalers[Options, Coder]
+	for _, a2 := range as {
+		if a2 != nil {
+			a.fncVals = append(a.fncVals, a2.fncVals...)
+			a.fromAny = a.fromAny || a2.fromAny
+		}
+	}
+	if len(a.fncVals) == 0 {
+		return nil
+	}
+	return &a
+}
+
+func (a *typedArshalers[Options, Coder]) lookup(fnc func(Options, *Coder, addressableValue) error, t reflect.Type) (func(Options, *Coder, addressableValue) error, bool) {
+	if a == nil {
+		return fnc, false
+	}
+	if v, ok := a.fncCache.Load(t); ok {
+		if v == nil {
+			return fnc, false
+		}
+		return v.(func(Options, *Coder, addressableValue) error), true
+	}
+
+	// Collect a list of arshalers that can be called for this type.
+	// This list may be longer than 1 since some arshalers can be skipped.
+	var fncs []func(Options, *Coder, addressableValue) error
+	for _, fncVal := range a.fncVals {
+		if !castableTo(t, fncVal.typ) {
+			continue
+		}
+		fncs = append(fncs, fncVal.fnc)
+		if !fncVal.maySkip {
+			break // subsequent arshalers will never be called
+		}
+	}
+
+	if len(fncs) == 0 {
+		a.fncCache.Store(t, nil) // nil to indicate that no funcs found
+		return fnc, false
+	}
+
+	// Construct an arshaler that may call every applicable arshaler.
+	fncDefault := fnc
+	fnc = func(o Options, c *Coder, v addressableValue) error {
+		for _, fnc := range fncs {
+			if err := fnc(o, c, v); err != SkipFunc {
+				return err // may be nil or non-nil
+			}
+		}
+		return fncDefault(o, c, v)
+	}
+
+	// Use the first stored so duplicate work can be garbage collected.
+	v, _ := a.fncCache.LoadOrStore(t, fnc)
+	return v.(func(Options, *Coder, addressableValue) error), true
+}
+
+// MarshalFuncV1 constructs a type-specific marshaler that
+// specifies how to marshal values of type T.
+// T can be any type except a named pointer.
+// The function is always provided with a non-nil pointer value
+// if T is an interface or pointer type.
+//
+// The function must marshal exactly one JSON value.
+// The value of T must not be retained outside the function call.
+// It may not return SkipFunc.
+func MarshalFuncV1[T any](fn func(T) ([]byte, error)) *Marshalers {
+	t := reflect.TypeOf((*T)(nil)).Elem()
+	assertCastableTo(t, true)
+	typFnc := typedMarshaler{
+		typ: t,
+		fnc: func(mo MarshalOptions, enc *Encoder, va addressableValue) error {
+			val, err := fn(va.castTo(t).Interface().(T))
+			if err != nil {
+				err = wrapSkipFunc(err, "marshal function of type func(T) ([]byte, error)")
+				// TODO: Avoid wrapping semantic errors.
+				return &SemanticError{action: "marshal", GoType: t, Err: err}
+			}
+			if err := enc.WriteValue(val); err != nil {
+				// TODO: Avoid wrapping semantic or I/O errors.
+				return &SemanticError{action: "marshal", JSONKind: RawValue(val).Kind(), GoType: t, Err: err}
+			}
+			return nil
+		},
+	}
+	return &Marshalers{fncVals: []typedMarshaler{typFnc}, fromAny: castableToFromAny(t)}
+}
+
+// MarshalFuncV2 constructs a type-specific marshaler that
+// specifies how to marshal values of type T.
+// T can be any type except a named pointer.
+// The function is always provided with a non-nil pointer value
+// if T is an interface or pointer type.
+//
+// The function must marshal exactly one JSON value by calling write methods
+// on the provided encoder. It may return SkipFunc such that marshaling can
+// move on to the next marshal function. However, no mutable method calls may
+// be called on the encoder if SkipFunc is returned.
+// The pointer to Encoder and the value of T must not be retained
+// outside the function call.
+func MarshalFuncV2[T any](fn func(MarshalOptions, *Encoder, T) error) *Marshalers {
+	t := reflect.TypeOf((*T)(nil)).Elem()
+	assertCastableTo(t, true)
+	typFnc := typedMarshaler{
+		typ: t,
+		fnc: func(mo MarshalOptions, enc *Encoder, va addressableValue) error {
+			prevDepth, prevLength := enc.tokens.depthLength()
+			err := fn(mo, enc, va.castTo(t).Interface().(T))
+			currDepth, currLength := enc.tokens.depthLength()
+			if err == nil && (prevDepth != currDepth || prevLength+1 != currLength) {
+				err = errors.New("must write exactly one JSON value")
+			}
+			if err != nil {
+				if err == SkipFunc {
+					if prevDepth == currDepth && prevLength == currLength {
+						return SkipFunc
+					}
+					err = errors.New("must not write any JSON tokens when skipping")
+				}
+				// TODO: Avoid wrapping semantic or I/O errors.
+				return &SemanticError{action: "marshal", GoType: t, Err: err}
+			}
+			return nil
+		},
+		maySkip: true,
+	}
+	return &Marshalers{fncVals: []typedMarshaler{typFnc}, fromAny: castableToFromAny(t)}
+}
+
+// UnmarshalFuncV1 constructs a type-specific unmarshaler that
+// specifies how to unmarshal values of type T.
+// T must be an unnamed pointer or an interface type.
+// The function is always provided with a non-nil pointer value.
+//
+// The function must unmarshal exactly one JSON value.
+// The input []byte must not be mutated.
+// The input []byte and value T must not be retained outside the function call.
+// It may not return SkipFunc.
+func UnmarshalFuncV1[T any](fn func([]byte, T) error) *Unmarshalers {
+	t := reflect.TypeOf((*T)(nil)).Elem()
+	assertCastableTo(t, false)
+	typFnc := typedUnmarshaler{
+		typ: t,
+		fnc: func(uo UnmarshalOptions, dec *Decoder, va addressableValue) error {
+			val, err := dec.ReadValue()
+			if err != nil {
+				return err // must be a syntactic or I/O error
+			}
+			err = fn(val, va.castTo(t).Interface().(T))
+			if err != nil {
+				err = wrapSkipFunc(err, "unmarshal function of type func([]byte, T) error")
+				// TODO: Avoid wrapping semantic, syntactic, or I/O errors.
+				return &SemanticError{action: "unmarshal", JSONKind: val.Kind(), GoType: t, Err: err}
+			}
+			return nil
+		},
+	}
+	return &Unmarshalers{fncVals: []typedUnmarshaler{typFnc}, fromAny: castableToFromAny(t)}
+}
+
+// UnmarshalFuncV2 constructs a type-specific unmarshaler that
+// specifies how to unmarshal values of type T.
+// T must be an unnamed pointer or an interface type.
+// The function is always provided with a non-nil pointer value.
+//
+// The function must unmarshal exactly one JSON value by calling read methods
+// on the provided decoder. It may return SkipFunc such that unmarshaling can
+// move on to the next unmarshal function. However, no mutable method calls may
+// be called on the decoder if SkipFunc is returned.
+// The pointer to Decoder and the value of T must not be retained
+// outside the function call.
+func UnmarshalFuncV2[T any](fn func(UnmarshalOptions, *Decoder, T) error) *Unmarshalers {
+	t := reflect.TypeOf((*T)(nil)).Elem()
+	assertCastableTo(t, false)
+	typFnc := typedUnmarshaler{
+		typ: t,
+		fnc: func(uo UnmarshalOptions, dec *Decoder, va addressableValue) error {
+			prevDepth, prevLength := dec.tokens.depthLength()
+			err := fn(uo, dec, va.castTo(t).Interface().(T))
+			currDepth, currLength := dec.tokens.depthLength()
+			if err == nil && (prevDepth != currDepth || prevLength+1 != currLength) {
+				err = errors.New("must read exactly one JSON value")
+			}
+			if err != nil {
+				if err == SkipFunc {
+					if prevDepth == currDepth && prevLength == currLength {
+						return SkipFunc
+					}
+					err = errors.New("must not read any JSON tokens when skipping")
+				}
+				// TODO: Avoid wrapping semantic, syntactic, or I/O errors.
+				return &SemanticError{action: "unmarshal", GoType: t, Err: err}
+			}
+			return nil
+		},
+		maySkip: true,
+	}
+	return &Unmarshalers{fncVals: []typedUnmarshaler{typFnc}, fromAny: castableToFromAny(t)}
+}
+
+// assertCastableTo asserts that "to" is a valid type to be casted to.
+// These are the Go types that type-specific arshalers may operate upon.
+//
+// Let AllTypes be the universal set of all possible Go types.
+// This function generally asserts that:
+//
+//	len([from for from in AllTypes if castableTo(from, to)]) > 0
+//
+// otherwise it panics.
+//
+// As a special-case if marshal is false, then we forbid any non-pointer or
+// non-interface type since it is almost always a bug trying to unmarshal
+// into something where the end-user caller did not pass in an addressable value
+// since they will not observe the mutations.
+func assertCastableTo(to reflect.Type, marshal bool) {
+	switch to.Kind() {
+	case reflect.Interface:
+		return
+	case reflect.Pointer:
+		// Only allow unnamed pointers to be consistent with the fact that
+		// taking the address of a value produces an unnamed pointer type.
+		if to.Name() == "" {
+			return
+		}
+	default:
+		// Technically, non-pointer types are permissible for unmarshal.
+		// However, they are often a bug since the receiver would be immutable.
+		// Thus, only allow them for marshaling.
+		if marshal {
+			return
+		}
+	}
+	if marshal {
+		panic(fmt.Sprintf("input type %v must be an interface type, an unnamed pointer type, or a non-pointer type", to))
+	} else {
+		panic(fmt.Sprintf("input type %v must be an interface type or an unnamed pointer type", to))
+	}
+}
+
+// castableTo checks whether values of type "from" can be casted to type "to".
+// Nil pointer or interface "from" values are never considered castable.
+//
+// This function must be kept in sync with addressableValue.castTo.
+func castableTo(from, to reflect.Type) bool {
+	switch to.Kind() {
+	case reflect.Interface:
+		// TODO: This breaks when ordinary interfaces can have type sets
+		// since interfaces now exist where only the value form of a type (T)
+		// implements the interface, but not the pointer variant (*T).
+		// See https://go.dev/issue/45346.
+		return reflect.PointerTo(from).Implements(to)
+	case reflect.Pointer:
+		// Common case for unmarshaling.
+		// From must be a concrete or interface type.
+		return reflect.PointerTo(from) == to
+	default:
+		// Common case for marshaling.
+		// From must be a concrete type.
+		return from == to
+	}
+}
+
+// castTo casts va to the specified type.
+// If the type is an interface, then the underlying type will always
+// be a non-nil pointer to a concrete type.
+//
+// Requirement: castableTo(va.Type(), to) must hold.
+func (va addressableValue) castTo(to reflect.Type) reflect.Value {
+	switch to.Kind() {
+	case reflect.Interface:
+		return va.Addr().Convert(to)
+	case reflect.Pointer:
+		return va.Addr()
+	default:
+		return va.Value
+	}
+}
+
+// castableToFromAny reports whether "to" can be casted to from any
+// of the dynamic types used to represent arbitrary JSON.
+func castableToFromAny(to reflect.Type) bool {
+	for _, from := range []reflect.Type{anyType, boolType, stringType, float64Type, mapStringAnyType, sliceAnyType} {
+		if castableTo(from, to) {
+			return true
+		}
+	}
+	return false
+}
+
+func wrapSkipFunc(err error, what string) error {
+	if err == SkipFunc {
+		return errors.New(what + " cannot be skipped")
+	}
+	return err
+}

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/arshal_inlined.go

@@ -0,0 +1,186 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"errors"
+	"reflect"
+)
+
+// This package supports "inlining" a Go struct field, where the contents
+// of the serialized field (which must be a JSON object) are treated as if
+// they are part of the parent Go struct (which represents a JSON object).
+//
+// Generally, inlined fields are of a Go struct type, where the fields of the
+// nested struct are virtually hoisted up to the parent struct using rules
+// similar to how Go embedding works (but operating within the JSON namespace).
+//
+// However, inlined fields may also be of a Go map type with a string key
+// or a RawValue. Such inlined fields are called "fallback" fields since they
+// represent any arbitrary JSON object member. Explicitly named fields take
+// precedence over the inlined fallback. Only one inlined fallback is allowed.
+
+var rawValueType = reflect.TypeOf((*RawValue)(nil)).Elem()
+
+// marshalInlinedFallbackAll marshals all the members in an inlined fallback.
+func marshalInlinedFallbackAll(mo MarshalOptions, enc *Encoder, va addressableValue, f *structField, insertUnquotedName func([]byte) bool) error {
+	v := addressableValue{va.Field(f.index[0])} // addressable if struct value is addressable
+	if len(f.index) > 1 {
+		v = v.fieldByIndex(f.index[1:], false)
+		if !v.IsValid() {
+			return nil // implies a nil inlined field
+		}
+	}
+	v = v.indirect(false)
+	if !v.IsValid() {
+		return nil
+	}
+
+	if v.Type() == rawValueType {
+		b := v.Interface().(RawValue)
+		if len(b) == 0 { // TODO: Should this be nil? What if it were all whitespace?
+			return nil
+		}
+
+		dec := getBufferedDecoder(b, DecodeOptions{AllowDuplicateNames: true, AllowInvalidUTF8: true})
+		defer putBufferedDecoder(dec)
+
+		tok, err := dec.ReadToken()
+		if err != nil {
+			return &SemanticError{action: "marshal", GoType: rawValueType, Err: err}
+		}
+		if tok.Kind() != '{' {
+			err := errors.New("inlined raw value must be a JSON object")
+			return &SemanticError{action: "marshal", JSONKind: tok.Kind(), GoType: rawValueType, Err: err}
+		}
+		for dec.PeekKind() != '}' {
+			// Parse the JSON object name.
+			var flags valueFlags
+			val, err := dec.readValue(&flags)
+			if err != nil {
+				return &SemanticError{action: "marshal", GoType: rawValueType, Err: err}
+			}
+			if insertUnquotedName != nil {
+				name := unescapeStringMayCopy(val, flags.isVerbatim())
+				if !insertUnquotedName(name) {
+					return &SyntacticError{str: "duplicate name " + string(val) + " in object"}
+				}
+			}
+			if err := enc.WriteValue(val); err != nil {
+				return err
+			}
+
+			// Parse the JSON object value.
+			val, err = dec.readValue(&flags)
+			if err != nil {
+				return &SemanticError{action: "marshal", GoType: rawValueType, Err: err}
+			}
+			if err := enc.WriteValue(val); err != nil {
+				return err
+			}
+		}
+		if _, err := dec.ReadToken(); err != nil {
+			return &SemanticError{action: "marshal", GoType: rawValueType, Err: err}
+		}
+		if err := dec.checkEOF(); err != nil {
+			return &SemanticError{action: "marshal", GoType: rawValueType, Err: err}
+		}
+		return nil
+	} else {
+		if v.Len() == 0 {
+			return nil
+		}
+		m := v
+		mv := newAddressableValue(m.Type().Elem())
+		for iter := m.MapRange(); iter.Next(); {
+			b, err := appendString(enc.UnusedBuffer(), iter.Key().String(), !enc.options.AllowInvalidUTF8, nil)
+			if err != nil {
+				return err
+			}
+			if insertUnquotedName != nil {
+				isVerbatim := consumeSimpleString(b) == len(b)
+				name := unescapeStringMayCopy(b, isVerbatim)
+				if !insertUnquotedName(name) {
+					return &SyntacticError{str: "duplicate name " + string(b) + " in object"}
+				}
+			}
+			if err := enc.WriteValue(b); err != nil {
+				return err
+			}
+
+			mv.Set(iter.Value())
+			marshal := f.fncs.marshal
+			if mo.Marshalers != nil {
+				marshal, _ = mo.Marshalers.lookup(marshal, mv.Type())
+			}
+			if err := marshal(mo, enc, mv); err != nil {
+				return err
+			}
+		}
+		return nil
+	}
+}
+
+// unmarshalInlinedFallbackNext unmarshals only the next member in an inlined fallback.
+func unmarshalInlinedFallbackNext(uo UnmarshalOptions, dec *Decoder, va addressableValue, f *structField, quotedName, unquotedName []byte) error {
+	v := addressableValue{va.Field(f.index[0])} // addressable if struct value is addressable
+	if len(f.index) > 1 {
+		v = v.fieldByIndex(f.index[1:], true)
+	}
+	v = v.indirect(true)
+
+	if v.Type() == rawValueType {
+		b := v.Addr().Interface().(*RawValue)
+		if len(*b) == 0 { // TODO: Should this be nil? What if it were all whitespace?
+			*b = append(*b, '{')
+		} else {
+			*b = trimSuffixWhitespace(*b)
+			if hasSuffixByte(*b, '}') {
+				// TODO: When merging into an object for the first time,
+				// should we verify that it is valid?
+				*b = trimSuffixByte(*b, '}')
+				*b = trimSuffixWhitespace(*b)
+				if !hasSuffixByte(*b, ',') && !hasSuffixByte(*b, '{') {
+					*b = append(*b, ',')
+				}
+			} else {
+				err := errors.New("inlined raw value must be a JSON object")
+				return &SemanticError{action: "unmarshal", GoType: rawValueType, Err: err}
+			}
+		}
+		*b = append(*b, quotedName...)
+		*b = append(*b, ':')
+		rawValue, err := dec.ReadValue()
+		if err != nil {
+			return err
+		}
+		*b = append(*b, rawValue...)
+		*b = append(*b, '}')
+		return nil
+	} else {
+		name := string(unquotedName) // TODO: Intern this?
+
+		m := v
+		if m.IsNil() {
+			m.Set(reflect.MakeMap(m.Type()))
+		}
+		mk := reflect.ValueOf(name)
+		mv := newAddressableValue(v.Type().Elem()) // TODO: Cache across calls?
+		if v2 := m.MapIndex(mk); v2.IsValid() {
+			mv.Set(v2)
+		}
+
+		unmarshal := f.fncs.unmarshal
+		if uo.Unmarshalers != nil {
+			unmarshal, _ = uo.Unmarshalers.lookup(unmarshal, mv.Type())
+		}
+		err := unmarshal(uo, dec, mv)
+		m.SetMapIndex(mk, mv.Value)
+		if err != nil {
+			return err
+		}
+		return nil
+	}
+}

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/arshal_methods.go

@@ -0,0 +1,229 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"encoding"
+	"errors"
+	"reflect"
+)
+
+// Interfaces for custom serialization.
+var (
+	jsonMarshalerV1Type   = reflect.TypeOf((*MarshalerV1)(nil)).Elem()
+	jsonMarshalerV2Type   = reflect.TypeOf((*MarshalerV2)(nil)).Elem()
+	jsonUnmarshalerV1Type = reflect.TypeOf((*UnmarshalerV1)(nil)).Elem()
+	jsonUnmarshalerV2Type = reflect.TypeOf((*UnmarshalerV2)(nil)).Elem()
+	textMarshalerType     = reflect.TypeOf((*encoding.TextMarshaler)(nil)).Elem()
+	textUnmarshalerType   = reflect.TypeOf((*encoding.TextUnmarshaler)(nil)).Elem()
+)
+
+// MarshalerV1 is implemented by types that can marshal themselves.
+// It is recommended that types implement MarshalerV2 unless
+// the implementation is trying to avoid a hard dependency on this package.
+//
+// It is recommended that implementations return a buffer that is safe
+// for the caller to retain and potentially mutate.
+type MarshalerV1 interface {
+	MarshalJSON() ([]byte, error)
+}
+
+// MarshalerV2 is implemented by types that can marshal themselves.
+// It is recommended that types implement MarshalerV2 instead of MarshalerV1
+// since this is both more performant and flexible.
+// If a type implements both MarshalerV1 and MarshalerV2,
+// then MarshalerV2 takes precedence. In such a case, both implementations
+// should aim to have equivalent behavior for the default marshal options.
+//
+// The implementation must write only one JSON value to the Encoder and
+// must not retain the pointer to Encoder.
+type MarshalerV2 interface {
+	MarshalNextJSON(MarshalOptions, *Encoder) error
+
+	// TODO: Should users call the MarshalOptions.MarshalNext method or
+	// should/can they call this method directly? Does it matter?
+}
+
+// UnmarshalerV1 is implemented by types that can unmarshal themselves.
+// It is recommended that types implement UnmarshalerV2 unless
+// the implementation is trying to avoid a hard dependency on this package.
+//
+// The input can be assumed to be a valid encoding of a JSON value
+// if called from unmarshal functionality in this package.
+// UnmarshalJSON must copy the JSON data if it is retained after returning.
+// It is recommended that UnmarshalJSON implement merge semantics when
+// unmarshaling into a pre-populated value.
+//
+// Implementations must not retain or mutate the input []byte.
+type UnmarshalerV1 interface {
+	UnmarshalJSON([]byte) error
+}
+
+// UnmarshalerV2 is implemented by types that can unmarshal themselves.
+// It is recommended that types implement UnmarshalerV2 instead of UnmarshalerV1
+// since this is both more performant and flexible.
+// If a type implements both UnmarshalerV1 and UnmarshalerV2,
+// then UnmarshalerV2 takes precedence. In such a case, both implementations
+// should aim to have equivalent behavior for the default unmarshal options.
+//
+// The implementation must read only one JSON value from the Decoder.
+// It is recommended that UnmarshalNextJSON implement merge semantics when
+// unmarshaling into a pre-populated value.
+//
+// Implementations must not retain the pointer to Decoder.
+type UnmarshalerV2 interface {
+	UnmarshalNextJSON(UnmarshalOptions, *Decoder) error
+
+	// TODO: Should users call the UnmarshalOptions.UnmarshalNext method or
+	// should/can they call this method directly? Does it matter?
+}
+
+func makeMethodArshaler(fncs *arshaler, t reflect.Type) *arshaler {
+	// Avoid injecting method arshaler on the pointer or interface version
+	// to avoid ever calling the method on a nil pointer or interface receiver.
+	// Let it be injected on the value receiver (which is always addressable).
+	if t.Kind() == reflect.Pointer || t.Kind() == reflect.Interface {
+		return fncs
+	}
+
+	// Handle custom marshaler.
+	switch which, needAddr := implementsWhich(t, jsonMarshalerV2Type, jsonMarshalerV1Type, textMarshalerType); which {
+	case jsonMarshalerV2Type:
+		fncs.nonDefault = true
+		fncs.marshal = func(mo MarshalOptions, enc *Encoder, va addressableValue) error {
+			prevDepth, prevLength := enc.tokens.depthLength()
+			err := va.addrWhen(needAddr).Interface().(MarshalerV2).MarshalNextJSON(mo, enc)
+			currDepth, currLength := enc.tokens.depthLength()
+			if (prevDepth != currDepth || prevLength+1 != currLength) && err == nil {
+				err = errors.New("must write exactly one JSON value")
+			}
+			if err != nil {
+				err = wrapSkipFunc(err, "marshal method")
+				// TODO: Avoid wrapping semantic or I/O errors.
+				return &SemanticError{action: "marshal", GoType: t, Err: err}
+			}
+			return nil
+		}
+	case jsonMarshalerV1Type:
+		fncs.nonDefault = true
+		fncs.marshal = func(mo MarshalOptions, enc *Encoder, va addressableValue) error {
+			marshaler := va.addrWhen(needAddr).Interface().(MarshalerV1)
+			val, err := marshaler.MarshalJSON()
+			if err != nil {
+				err = wrapSkipFunc(err, "marshal method")
+				// TODO: Avoid wrapping semantic errors.
+				return &SemanticError{action: "marshal", GoType: t, Err: err}
+			}
+			if err := enc.WriteValue(val); err != nil {
+				// TODO: Avoid wrapping semantic or I/O errors.
+				return &SemanticError{action: "marshal", JSONKind: RawValue(val).Kind(), GoType: t, Err: err}
+			}
+			return nil
+		}
+	case textMarshalerType:
+		fncs.nonDefault = true
+		fncs.marshal = func(mo MarshalOptions, enc *Encoder, va addressableValue) error {
+			marshaler := va.addrWhen(needAddr).Interface().(encoding.TextMarshaler)
+			s, err := marshaler.MarshalText()
+			if err != nil {
+				err = wrapSkipFunc(err, "marshal method")
+				// TODO: Avoid wrapping semantic errors.
+				return &SemanticError{action: "marshal", JSONKind: '"', GoType: t, Err: err}
+			}
+			val := enc.UnusedBuffer()
+			val, err = appendString(val, string(s), true, nil)
+			if err != nil {
+				return &SemanticError{action: "marshal", JSONKind: '"', GoType: t, Err: err}
+			}
+			if err := enc.WriteValue(val); err != nil {
+				// TODO: Avoid wrapping syntactic or I/O errors.
+				return &SemanticError{action: "marshal", JSONKind: '"', GoType: t, Err: err}
+			}
+			return nil
+		}
+	}
+
+	// Handle custom unmarshaler.
+	switch which, needAddr := implementsWhich(t, jsonUnmarshalerV2Type, jsonUnmarshalerV1Type, textUnmarshalerType); which {
+	case jsonUnmarshalerV2Type:
+		fncs.nonDefault = true
+		fncs.unmarshal = func(uo UnmarshalOptions, dec *Decoder, va addressableValue) error {
+			prevDepth, prevLength := dec.tokens.depthLength()
+			err := va.addrWhen(needAddr).Interface().(UnmarshalerV2).UnmarshalNextJSON(uo, dec)
+			currDepth, currLength := dec.tokens.depthLength()
+			if (prevDepth != currDepth || prevLength+1 != currLength) && err == nil {
+				err = errors.New("must read exactly one JSON value")
+			}
+			if err != nil {
+				err = wrapSkipFunc(err, "unmarshal method")
+				// TODO: Avoid wrapping semantic, syntactic, or I/O errors.
+				return &SemanticError{action: "unmarshal", GoType: t, Err: err}
+			}
+			return nil
+		}
+	case jsonUnmarshalerV1Type:
+		fncs.nonDefault = true
+		fncs.unmarshal = func(uo UnmarshalOptions, dec *Decoder, va addressableValue) error {
+			val, err := dec.ReadValue()
+			if err != nil {
+				return err // must be a syntactic or I/O error
+			}
+			unmarshaler := va.addrWhen(needAddr).Interface().(UnmarshalerV1)
+			if err := unmarshaler.UnmarshalJSON(val); err != nil {
+				err = wrapSkipFunc(err, "unmarshal method")
+				// TODO: Avoid wrapping semantic, syntactic, or I/O errors.
+				return &SemanticError{action: "unmarshal", JSONKind: val.Kind(), GoType: t, Err: err}
+			}
+			return nil
+		}
+	case textUnmarshalerType:
+		fncs.nonDefault = true
+		fncs.unmarshal = func(uo UnmarshalOptions, dec *Decoder, va addressableValue) error {
+			var flags valueFlags
+			val, err := dec.readValue(&flags)
+			if err != nil {
+				return err // must be a syntactic or I/O error
+			}
+			if val.Kind() != '"' {
+				err = errors.New("JSON value must be string type")
+				return &SemanticError{action: "unmarshal", JSONKind: val.Kind(), GoType: t, Err: err}
+			}
+			s := unescapeStringMayCopy(val, flags.isVerbatim())
+			unmarshaler := va.addrWhen(needAddr).Interface().(encoding.TextUnmarshaler)
+			if err := unmarshaler.UnmarshalText(s); err != nil {
+				err = wrapSkipFunc(err, "unmarshal method")
+				// TODO: Avoid wrapping semantic, syntactic, or I/O errors.
+				return &SemanticError{action: "unmarshal", JSONKind: val.Kind(), GoType: t, Err: err}
+			}
+			return nil
+		}
+	}
+
+	return fncs
+}
+
+// implementsWhich is like t.Implements(ifaceType) for a list of interfaces,
+// but checks whether either t or reflect.PointerTo(t) implements the interface.
+// It returns the first interface type that matches and whether a value of t
+// needs to be addressed first before it implements the interface.
+func implementsWhich(t reflect.Type, ifaceTypes ...reflect.Type) (which reflect.Type, needAddr bool) {
+	for _, ifaceType := range ifaceTypes {
+		switch {
+		case t.Implements(ifaceType):
+			return ifaceType, false
+		case reflect.PointerTo(t).Implements(ifaceType):
+			return ifaceType, true
+		}
+	}
+	return nil, false
+}
+
+// addrWhen returns va.Addr if addr is specified, otherwise it returns itself.
+func (va addressableValue) addrWhen(addr bool) reflect.Value {
+	if addr {
+		return va.Addr()
+	}
+	return va.Value
+}

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/arshal_time.go

@@ -0,0 +1,196 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"fmt"
+	"reflect"
+	"strings"
+	"time"
+)
+
+var (
+	timeDurationType = reflect.TypeOf((*time.Duration)(nil)).Elem()
+	timeTimeType     = reflect.TypeOf((*time.Time)(nil)).Elem()
+)
+
+func makeTimeArshaler(fncs *arshaler, t reflect.Type) *arshaler {
+	// Ideally, time types would implement MarshalerV2 and UnmarshalerV2,
+	// but that would incur a dependency on package json from package time.
+	// Given how widely used time is, it is more acceptable that we incur a
+	// dependency on time from json.
+	//
+	// Injecting the arshaling functionality like this will not be identical
+	// to actually declaring methods on the time types since embedding of the
+	// time types will not be able to forward this functionality.
+	switch t {
+	case timeDurationType:
+		fncs.nonDefault = true
+		marshalNanos := fncs.marshal
+		fncs.marshal = func(mo MarshalOptions, enc *Encoder, va addressableValue) error {
+			if mo.format != "" && mo.formatDepth == enc.tokens.depth() {
+				if mo.format == "nanos" {
+					mo.format = ""
+					return marshalNanos(mo, enc, va)
+				} else {
+					return newInvalidFormatError("marshal", t, mo.format)
+				}
+			}
+
+			td := va.Interface().(time.Duration)
+			b := enc.UnusedBuffer()
+			b = append(b, '"')
+			b = append(b, td.String()...) // never contains special characters
+			b = append(b, '"')
+			return enc.WriteValue(b)
+		}
+		unmarshalNanos := fncs.unmarshal
+		fncs.unmarshal = func(uo UnmarshalOptions, dec *Decoder, va addressableValue) error {
+			// TODO: Should there be a flag that specifies that we can unmarshal
+			// from either form since there would be no ambiguity?
+			if uo.format != "" && uo.formatDepth == dec.tokens.depth() {
+				if uo.format == "nanos" {
+					uo.format = ""
+					return unmarshalNanos(uo, dec, va)
+				} else {
+					return newInvalidFormatError("unmarshal", t, uo.format)
+				}
+			}
+
+			var flags valueFlags
+			td := va.Addr().Interface().(*time.Duration)
+			val, err := dec.readValue(&flags)
+			if err != nil {
+				return err
+			}
+			switch k := val.Kind(); k {
+			case 'n':
+				*td = time.Duration(0)
+				return nil
+			case '"':
+				val = unescapeStringMayCopy(val, flags.isVerbatim())
+				td2, err := time.ParseDuration(string(val))
+				if err != nil {
+					return &SemanticError{action: "unmarshal", JSONKind: k, GoType: t, Err: err}
+				}
+				*td = td2
+				return nil
+			default:
+				return &SemanticError{action: "unmarshal", JSONKind: k, GoType: t}
+			}
+		}
+	case timeTimeType:
+		fncs.nonDefault = true
+		fncs.marshal = func(mo MarshalOptions, enc *Encoder, va addressableValue) error {
+			format := time.RFC3339Nano
+			if mo.format != "" && mo.formatDepth == enc.tokens.depth() {
+				var err error
+				format, err = checkTimeFormat(mo.format)
+				if err != nil {
+					return &SemanticError{action: "marshal", GoType: t, Err: err}
+				}
+			}
+
+			tt := va.Interface().(time.Time)
+			if y := tt.Year(); y < 0 || y >= 10000 {
+				// RFC 3339 is clear that years are 4 digits exactly.
+				// See https://go.dev/issue/4556#c15 for more discussion.
+				err := fmt.Errorf("year %d outside of range [0,9999]", y)
+				return &SemanticError{action: "marshal", GoType: t, Err: err}
+			}
+			b := enc.UnusedBuffer()
+			b = append(b, '"')
+			b = tt.AppendFormat(b, format)
+			b = append(b, '"')
+			// The format may contain special characters that need escaping.
+			// Verify that the result is a valid JSON string (common case),
+			// otherwise escape the string correctly (slower case).
+			if consumeSimpleString(b) != len(b) {
+				b, _ = appendString(nil, string(b[len(`"`):len(b)-len(`"`)]), true, nil)
+			}
+			return enc.WriteValue(b)
+		}
+		fncs.unmarshal = func(uo UnmarshalOptions, dec *Decoder, va addressableValue) error {
+			format := time.RFC3339Nano
+			if uo.format != "" && uo.formatDepth == dec.tokens.depth() {
+				var err error
+				format, err = checkTimeFormat(uo.format)
+				if err != nil {
+					return &SemanticError{action: "unmarshal", GoType: t, Err: err}
+				}
+			}
+
+			var flags valueFlags
+			tt := va.Addr().Interface().(*time.Time)
+			val, err := dec.readValue(&flags)
+			if err != nil {
+				return err
+			}
+			k := val.Kind()
+			switch k {
+			case 'n':
+				*tt = time.Time{}
+				return nil
+			case '"':
+				val = unescapeStringMayCopy(val, flags.isVerbatim())
+				tt2, err := time.Parse(format, string(val))
+				if err != nil {
+					return &SemanticError{action: "unmarshal", JSONKind: k, GoType: t, Err: err}
+				}
+				*tt = tt2
+				return nil
+			default:
+				return &SemanticError{action: "unmarshal", JSONKind: k, GoType: t}
+			}
+		}
+	}
+	return fncs
+}
+
+func checkTimeFormat(format string) (string, error) {
+	// We assume that an exported constant in the time package will
+	// always start with an uppercase ASCII letter.
+	if len(format) > 0 && 'A' <= format[0] && format[0] <= 'Z' {
+		switch format {
+		case "ANSIC":
+			return time.ANSIC, nil
+		case "UnixDate":
+			return time.UnixDate, nil
+		case "RubyDate":
+			return time.RubyDate, nil
+		case "RFC822":
+			return time.RFC822, nil
+		case "RFC822Z":
+			return time.RFC822Z, nil
+		case "RFC850":
+			return time.RFC850, nil
+		case "RFC1123":
+			return time.RFC1123, nil
+		case "RFC1123Z":
+			return time.RFC1123Z, nil
+		case "RFC3339":
+			return time.RFC3339, nil
+		case "RFC3339Nano":
+			return time.RFC3339Nano, nil
+		case "Kitchen":
+			return time.Kitchen, nil
+		case "Stamp":
+			return time.Stamp, nil
+		case "StampMilli":
+			return time.StampMilli, nil
+		case "StampMicro":
+			return time.StampMicro, nil
+		case "StampNano":
+			return time.StampNano, nil
+		default:
+			// Reject any format that is an exported Go identifier in case
+			// new format constants are added to the time package.
+			if strings.TrimFunc(format, isLetterOrDigit) == "" {
+				return "", fmt.Errorf("undefined format layout: %v", format)
+			}
+		}
+	}
+	return format, nil
+}

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/doc.go

@@ -0,0 +1,185 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package json implements serialization of JSON
+// as specified in RFC 4627, RFC 7159, RFC 7493, RFC 8259, and RFC 8785.
+// JSON is a simple data interchange format that can represent
+// primitive data types such as booleans, strings, and numbers,
+// in addition to structured data types such as objects and arrays.
+//
+//
+// Terminology
+//
+// This package uses the terms "encode" and "decode" for syntactic functionality
+// that is concerned with processing JSON based on its grammar, and
+// uses the terms "marshal" and "unmarshal" for semantic functionality
+// that determines the meaning of JSON values as Go values and vice-versa.
+// It aims to provide a clear distinction between functionality that
+// is purely concerned with encoding versus that of marshaling.
+// For example, one can directly encode a stream of JSON tokens without
+// needing to marshal a concrete Go value representing them.
+// Similarly, one can decode a stream of JSON tokens without
+// needing to unmarshal them into a concrete Go value.
+//
+// This package uses JSON terminology when discussing JSON, which may differ
+// from related concepts in Go or elsewhere in computing literature.
+//
+//   - A JSON "object" refers to an unordered collection of name/value members.
+//   - A JSON "array" refers to an ordered sequence of elements.
+//   - A JSON "value" refers to either a literal (i.e., null, false, or true),
+//     string, number, object, or array.
+//
+// See RFC 8259 for more information.
+//
+//
+// Specifications
+//
+// Relevant specifications include RFC 4627, RFC 7159, RFC 7493, RFC 8259,
+// and RFC 8785. Each RFC is generally a stricter subset of another RFC.
+// In increasing order of strictness:
+//
+//   - RFC 4627 and RFC 7159 do not require (but recommend) the use of UTF-8
+//     and also do not require (but recommend) that object names be unique.
+//   - RFC 8259 requires the use of UTF-8,
+//     but does not require (but recommends) that object names be unique.
+//   - RFC 7493 requires the use of UTF-8
+//     and also requires that object names be unique.
+//   - RFC 8785 defines a canonical representation. It requires the use of UTF-8
+//     and also requires that object names be unique and in a specific ordering.
+//     It specifies exactly how strings and numbers must be formatted.
+//
+// The primary difference between RFC 4627 and RFC 7159 is that the former
+// restricted top-level values to only JSON objects and arrays, while
+// RFC 7159 and subsequent RFCs permit top-level values to additionally be
+// JSON nulls, booleans, strings, or numbers.
+//
+// By default, this package operates on RFC 7493, but can be configured
+// to operate according to the other RFC specifications.
+// RFC 7493 is a stricter subset of RFC 8259 and fully compliant with it.
+// In particular, it makes specific choices about behavior that RFC 8259
+// leaves as undefined in order to ensure greater interoperability.
+//
+//
+// JSON Representation of Go structs
+//
+// A Go struct is naturally represented as a JSON object,
+// where each Go struct field corresponds with a JSON object member.
+// When marshaling, all Go struct fields are recursively encoded in depth-first
+// order as JSON object members except those that are ignored or omitted.
+// When unmarshaling, JSON object members are recursively decoded
+// into the corresponding Go struct fields.
+// Object members that do not match any struct fields,
+// also known as “unknown members”, are ignored by default or rejected
+// if UnmarshalOptions.RejectUnknownMembers is specified.
+//
+// The representation of each struct field can be customized in the
+// "json" struct field tag, where the tag is a comma separated list of options.
+// As a special case, if the entire tag is `json:"-"`,
+// then the field is ignored with regard to its JSON representation.
+//
+// The first option is the JSON object name override for the Go struct field.
+// If the name is not specified, then the Go struct field name
+// is used as the JSON object name. JSON names containing commas or quotes,
+// or names identical to "" or "-", can be specified using
+// a single-quoted string literal, where the syntax is identical to
+// the Go grammar for a double-quoted string literal,
+// but instead uses single quotes as the delimiters.
+// By default, unmarshaling uses case-sensitive matching to identify
+// the Go struct field associated with a JSON object name.
+//
+// After the name, the following tag options are supported:
+//
+//   - omitzero: When marshaling, the "omitzero" option specifies that
+//     the struct field should be omitted if the field value is zero
+//     as determined by the "IsZero() bool" method if present,
+//     otherwise based on whether the field is the zero Go value.
+//     This option has no effect when unmarshaling.
+//
+//   - omitempty: When marshaling, the "omitempty" option specifies that
+//     the struct field should be omitted if the field value would have been
+//     encoded as a JSON null, empty string, empty object, or empty array.
+//     This option has no effect when unmarshaling.
+//
+//   - string: The "string" option specifies that
+//     MarshalOptions.StringifyNumbers and UnmarshalOptions.StringifyNumbers
+//     be set when marshaling or unmarshaling a struct field value.
+//     This causes numeric types to be encoded as a JSON number
+//     within a JSON string, and to be decoded from either a JSON number or
+//     a JSON string containing a JSON number.
+//     This extra level of encoding is often necessary since
+//     many JSON parsers cannot precisely represent 64-bit integers.
+//
+//   - nocase: When unmarshaling, the "nocase" option specifies that
+//     if the JSON object name does not exactly match the JSON name
+//     for any of the struct fields, then it attempts to match the struct field
+//     using a case-insensitive match that also ignores dashes and underscores.
+//     If multiple fields match, the first declared field in breadth-first order
+//     takes precedence. This option has no effect when marshaling.
+//
+//   - inline: The "inline" option specifies that
+//     the JSON representable content of this field type is to be promoted
+//     as if they were specified in the parent struct.
+//     It is the JSON equivalent of Go struct embedding.
+//     A Go embedded field is implicitly inlined unless an explicit JSON name
+//     is specified. The inlined field must be a Go struct
+//     (that does not implement any JSON methods), RawValue, map[string]T,
+//     or an unnamed pointer to such types. When marshaling,
+//     inlined fields from a pointer type are omitted if it is nil.
+//     Inlined fields of type RawValue and map[string]T are called
+//     “inlined fallbacks” as they can represent all possible
+//     JSON object members not directly handled by the parent struct.
+//     Only one inlined fallback field may be specified in a struct,
+//     while many non-fallback fields may be specified. This option
+//     must not be specified with any other option (including the JSON name).
+//
+//   - unknown: The "unknown" option is a specialized variant
+//     of the inlined fallback to indicate that this Go struct field
+//     contains any number of unknown JSON object members. The field type
+//     must be a RawValue, map[string]T, or an unnamed pointer to such types.
+//     If MarshalOptions.DiscardUnknownMembers is specified when marshaling,
+//     the contents of this field are ignored.
+//     If UnmarshalOptions.RejectUnknownMembers is specified when unmarshaling,
+//     any unknown object members are rejected regardless of whether
+//     an inlined fallback with the "unknown" option exists. This option
+//     must not be specified with any other option (including the JSON name).
+//
+//   - format: The "format" option specifies a format flag
+//     used to specialize the formatting of the field value.
+//     The option is a key-value pair specified as "format:value" where
+//     the value must be either a literal consisting of letters and numbers
+//     (e.g., "format:RFC3339") or a single-quoted string literal
+//     (e.g., "format:'2006-01-02'"). The interpretation of the format flag
+//     is determined by the struct field type.
+//
+// The "omitzero" and "omitempty" options are mostly semantically identical.
+// The former is defined in terms of the Go type system,
+// while the latter in terms of the JSON type system.
+// Consequently they behave differently in some circumstances.
+// For example, only a nil slice or map is omitted under "omitzero", while
+// an empty slice or map is omitted under "omitempty" regardless of nilness.
+// The "omitzero" option is useful for types with a well-defined zero value
+// (e.g., netip.Addr) or have an IsZero method (e.g., time.Time).
+//
+// Every Go struct corresponds to a list of JSON representable fields
+// which is constructed by performing a breadth-first search over
+// all struct fields (excluding unexported or ignored fields),
+// where the search recursively descends into inlined structs.
+// The set of non-inlined fields in a struct must have unique JSON names.
+// If multiple fields all have the same JSON name, then the one
+// at shallowest depth takes precedence and the other fields at deeper depths
+// are excluded from the list of JSON representable fields.
+// If multiple fields at the shallowest depth have the same JSON name,
+// then all of those fields are excluded from the list. This is analogous to
+// Go visibility rules for struct field selection with embedded struct types.
+//
+// Marshaling or unmarshaling a non-empty struct
+// without any JSON representable fields results in a SemanticError.
+// Unexported fields must not have any `json` tags except for `json:"-"`.
+package json
+
+// requireKeyedLiterals can be embedded in a struct to require keyed literals.
+type requireKeyedLiterals struct{}
+
+// nonComparable can be embedded in a struct to prevent comparability.
+type nonComparable [0]func()

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/errors.go

@@ -0,0 +1,183 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"errors"
+	"reflect"
+	"strconv"
+	"strings"
+	"unicode/utf8"
+)
+
+const errorPrefix = "json: "
+
+// Error matches errors returned by this package according to errors.Is.
+const Error = jsonError("json error")
+
+type jsonError string
+
+func (e jsonError) Error() string {
+	return string(e)
+}
+func (e jsonError) Is(target error) bool {
+	return e == target || target == Error
+}
+
+type ioError struct {
+	action string // either "read" or "write"
+	err    error
+}
+
+func (e *ioError) Error() string {
+	return errorPrefix + e.action + " error: " + e.err.Error()
+}
+func (e *ioError) Unwrap() error {
+	return e.err
+}
+func (e *ioError) Is(target error) bool {
+	return e == target || target == Error || errors.Is(e.err, target)
+}
+
+// SemanticError describes an error determining the meaning
+// of JSON data as Go data or vice-versa.
+//
+// The contents of this error as produced by this package may change over time.
+type SemanticError struct {
+	requireKeyedLiterals
+	nonComparable
+
+	action string // either "marshal" or "unmarshal"
+
+	// ByteOffset indicates that an error occurred after this byte offset.
+	ByteOffset int64
+	// JSONPointer indicates that an error occurred within this JSON value
+	// as indicated using the JSON Pointer notation (see RFC 6901).
+	JSONPointer string
+
+	// JSONKind is the JSON kind that could not be handled.
+	JSONKind Kind // may be zero if unknown
+	// GoType is the Go type that could not be handled.
+	GoType reflect.Type // may be nil if unknown
+
+	// Err is the underlying error.
+	Err error // may be nil
+}
+
+func (e *SemanticError) Error() string {
+	var sb strings.Builder
+	sb.WriteString(errorPrefix)
+
+	// Hyrum-proof the error message by deliberately switching between
+	// two equivalent renderings of the same error message.
+	// The randomization is tied to the Hyrum-proofing already applied
+	// on map iteration in Go.
+	for phrase := range map[string]struct{}{"cannot": {}, "unable to": {}} {
+		sb.WriteString(phrase)
+		break // use whichever phrase we get in the first iteration
+	}
+
+	// Format action.
+	var preposition string
+	switch e.action {
+	case "marshal":
+		sb.WriteString(" marshal")
+		preposition = " from"
+	case "unmarshal":
+		sb.WriteString(" unmarshal")
+		preposition = " into"
+	default:
+		sb.WriteString(" handle")
+		preposition = " with"
+	}
+
+	// Format JSON kind.
+	var omitPreposition bool
+	switch e.JSONKind {
+	case 'n':
+		sb.WriteString(" JSON null")
+	case 'f', 't':
+		sb.WriteString(" JSON boolean")
+	case '"':
+		sb.WriteString(" JSON string")
+	case '0':
+		sb.WriteString(" JSON number")
+	case '{', '}':
+		sb.WriteString(" JSON object")
+	case '[', ']':
+		sb.WriteString(" JSON array")
+	default:
+		omitPreposition = true
+	}
+
+	// Format Go type.
+	if e.GoType != nil {
+		if !omitPreposition {
+			sb.WriteString(preposition)
+		}
+		sb.WriteString(" Go value of type ")
+		sb.WriteString(e.GoType.String())
+	}
+
+	// Format where.
+	switch {
+	case e.JSONPointer != "":
+		sb.WriteString(" within JSON value at ")
+		sb.WriteString(strconv.Quote(e.JSONPointer))
+	case e.ByteOffset > 0:
+		sb.WriteString(" after byte offset ")
+		sb.WriteString(strconv.FormatInt(e.ByteOffset, 10))
+	}
+
+	// Format underlying error.
+	if e.Err != nil {
+		sb.WriteString(": ")
+		sb.WriteString(e.Err.Error())
+	}
+
+	return sb.String()
+}
+func (e *SemanticError) Is(target error) bool {
+	return e == target || target == Error || errors.Is(e.Err, target)
+}
+func (e *SemanticError) Unwrap() error {
+	return e.Err
+}
+
+// SyntacticError is a description of a syntactic error that occurred when
+// encoding or decoding JSON according to the grammar.
+//
+// The contents of this error as produced by this package may change over time.
+type SyntacticError struct {
+	requireKeyedLiterals
+	nonComparable
+
+	// ByteOffset indicates that an error occurred after this byte offset.
+	ByteOffset int64
+	str        string
+}
+
+func (e *SyntacticError) Error() string {
+	return errorPrefix + e.str
+}
+func (e *SyntacticError) Is(target error) bool {
+	return e == target || target == Error
+}
+func (e *SyntacticError) withOffset(pos int64) error {
+	return &SyntacticError{ByteOffset: pos, str: e.str}
+}
+
+func newInvalidCharacterError(prefix []byte, where string) *SyntacticError {
+	what := quoteRune(prefix)
+	return &SyntacticError{str: "invalid character " + what + " " + where}
+}
+
+func quoteRune(b []byte) string {
+	r, n := utf8.DecodeRune(b)
+	if r == utf8.RuneError && n == 1 {
+		return `'\x` + strconv.FormatUint(uint64(b[0]), 16) + `'`
+	}
+	return strconv.QuoteRune(r)
+}

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/fields.go

@@ -0,0 +1,509 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"reflect"
+	"sort"
+	"strconv"
+	"strings"
+	"unicode"
+	"unicode/utf8"
+)
+
+var errIgnoredField = errors.New("ignored field")
+
+type isZeroer interface {
+	IsZero() bool
+}
+
+var isZeroerType = reflect.TypeOf((*isZeroer)(nil)).Elem()
+
+type structFields struct {
+	flattened       []structField // listed in depth-first ordering
+	byActualName    map[string]*structField
+	byFoldedName    map[string][]*structField
+	inlinedFallback *structField
+}
+
+type structField struct {
+	id      int   // unique numeric ID in breadth-first ordering
+	index   []int // index into a struct according to reflect.Type.FieldByIndex
+	typ     reflect.Type
+	fncs    *arshaler
+	isZero  func(addressableValue) bool
+	isEmpty func(addressableValue) bool
+	fieldOptions
+}
+
+func makeStructFields(root reflect.Type) (structFields, *SemanticError) {
+	var fs structFields
+	fs.byActualName = make(map[string]*structField, root.NumField())
+	fs.byFoldedName = make(map[string][]*structField, root.NumField())
+
+	// ambiguous is a sentinel value to indicate that at least two fields
+	// at the same depth have the same name, and thus cancel each other out.
+	// This follows the same rules as selecting a field on embedded structs
+	// where the shallowest field takes precedence. If more than one field
+	// exists at the shallowest depth, then the selection is illegal.
+	// See https://go.dev/ref/spec#Selectors.
+	ambiguous := new(structField)
+
+	// Setup a queue for a breath-first search.
+	var queueIndex int
+	type queueEntry struct {
+		typ           reflect.Type
+		index         []int
+		visitChildren bool // whether to recursively visit inlined field in this struct
+	}
+	queue := []queueEntry{{root, nil, true}}
+	seen := map[reflect.Type]bool{root: true}
+
+	// Perform a breadth-first search over all reachable fields.
+	// This ensures that len(f.index) will be monotonically increasing.
+	for queueIndex < len(queue) {
+		qe := queue[queueIndex]
+		queueIndex++
+
+		t := qe.typ
+		inlinedFallbackIndex := -1         // index of last inlined fallback field in current struct
+		namesIndex := make(map[string]int) // index of each field with a given JSON object name in current struct
+		var hasAnyJSONTag bool             // whether any Go struct field has a `json` tag
+		var hasAnyJSONField bool           // whether any JSON serializable fields exist in current struct
+		for i := 0; i < t.NumField(); i++ {
+			sf := t.Field(i)
+			_, hasTag := sf.Tag.Lookup("json")
+			hasAnyJSONTag = hasAnyJSONTag || hasTag
+			options, err := parseFieldOptions(sf)
+			if err != nil {
+				if err == errIgnoredField {
+					continue
+				}
+				return structFields{}, &SemanticError{GoType: t, Err: err}
+			}
+			hasAnyJSONField = true
+			f := structField{
+				// Allocate a new slice (len=N+1) to hold both
+				// the parent index (len=N) and the current index (len=1).
+				// Do this to avoid clobbering the memory of the parent index.
+				index:        append(append(make([]int, 0, len(qe.index)+1), qe.index...), i),
+				typ:          sf.Type,
+				fieldOptions: options,
+			}
+			if sf.Anonymous && !f.hasName {
+				f.inline = true // implied by use of Go embedding without an explicit name
+			}
+			if f.inline || f.unknown {
+				// Handle an inlined field that serializes to/from
+				// zero or more JSON object members.
+
+				if f.inline && f.unknown {
+					err := fmt.Errorf("Go struct field %s cannot have both `inline` and `unknown` specified", sf.Name)
+					return structFields{}, &SemanticError{GoType: t, Err: err}
+				}
+				switch f.fieldOptions {
+				case fieldOptions{name: f.name, quotedName: f.quotedName, inline: true}:
+				case fieldOptions{name: f.name, quotedName: f.quotedName, unknown: true}:
+				default:
+					err := fmt.Errorf("Go struct field %s cannot have any options other than `inline` or `unknown` specified", sf.Name)
+					return structFields{}, &SemanticError{GoType: t, Err: err}
+				}
+
+				// Unwrap one level of pointer indirection similar to how Go
+				// only allows embedding either T or *T, but not **T.
+				tf := f.typ
+				if tf.Kind() == reflect.Pointer && tf.Name() == "" {
+					tf = tf.Elem()
+				}
+				// Reject any types with custom serialization otherwise
+				// it becomes impossible to know what sub-fields to inline.
+				if which, _ := implementsWhich(tf,
+					jsonMarshalerV2Type, jsonMarshalerV1Type, textMarshalerType,
+					jsonUnmarshalerV2Type, jsonUnmarshalerV1Type, textUnmarshalerType,
+				); which != nil && tf != rawValueType {
+					err := fmt.Errorf("inlined Go struct field %s of type %s must not implement JSON marshal or unmarshal methods", sf.Name, tf)
+					return structFields{}, &SemanticError{GoType: t, Err: err}
+				}
+
+				// Handle an inlined field that serializes to/from
+				// a finite number of JSON object members backed by a Go struct.
+				if tf.Kind() == reflect.Struct {
+					if f.unknown {
+						err := fmt.Errorf("inlined Go struct field %s of type %s with `unknown` tag must be a Go map of string key or a json.RawValue", sf.Name, tf)
+						return structFields{}, &SemanticError{GoType: t, Err: err}
+					}
+					if qe.visitChildren {
+						queue = append(queue, queueEntry{tf, f.index, !seen[tf]})
+					}
+					seen[tf] = true
+					continue
+				}
+
+				// Handle an inlined field that serializes to/from any number of
+				// JSON object members back by a Go map or RawValue.
+				switch {
+				case tf == rawValueType:
+					f.fncs = nil // specially handled in arshal_inlined.go
+				case tf.Kind() == reflect.Map && tf.Key() == stringType:
+					f.fncs = lookupArshaler(tf.Elem())
+				default:
+					err := fmt.Errorf("inlined Go struct field %s of type %s must be a Go struct, Go map of string key, or json.RawValue", sf.Name, tf)
+					return structFields{}, &SemanticError{GoType: t, Err: err}
+				}
+
+				// Reject multiple inlined fallback fields within the same struct.
+				if inlinedFallbackIndex >= 0 {
+					err := fmt.Errorf("inlined Go struct fields %s and %s cannot both be a Go map or json.RawValue", t.Field(inlinedFallbackIndex).Name, sf.Name)
+					return structFields{}, &SemanticError{GoType: t, Err: err}
+				}
+				inlinedFallbackIndex = i
+
+				// Multiple inlined fallback fields across different structs
+				// follow the same precedence rules as Go struct embedding.
+				if fs.inlinedFallback == nil {
+					fs.inlinedFallback = &f // store first occurrence at lowest depth
+				} else if len(fs.inlinedFallback.index) == len(f.index) {
+					fs.inlinedFallback = ambiguous // at least two occurrences at same depth
+				}
+			} else {
+				// Handle normal Go struct field that serializes to/from
+				// a single JSON object member.
+
+				// Provide a function that uses a type's IsZero method.
+				switch {
+				case sf.Type.Kind() == reflect.Interface && sf.Type.Implements(isZeroerType):
+					f.isZero = func(va addressableValue) bool {
+						// Avoid panics calling IsZero on a nil interface or
+						// non-nil interface with nil pointer.
+						return va.IsNil() || (va.Elem().Kind() == reflect.Pointer && va.Elem().IsNil()) || va.Interface().(isZeroer).IsZero()
+					}
+				case sf.Type.Kind() == reflect.Pointer && sf.Type.Implements(isZeroerType):
+					f.isZero = func(va addressableValue) bool {
+						// Avoid panics calling IsZero on nil pointer.
+						return va.IsNil() || va.Interface().(isZeroer).IsZero()
+					}
+				case sf.Type.Implements(isZeroerType):
+					f.isZero = func(va addressableValue) bool { return va.Interface().(isZeroer).IsZero() }
+				case reflect.PointerTo(sf.Type).Implements(isZeroerType):
+					f.isZero = func(va addressableValue) bool { return va.Addr().Interface().(isZeroer).IsZero() }
+				}
+
+				// Provide a function that can determine whether the value would
+				// serialize as an empty JSON value.
+				switch sf.Type.Kind() {
+				case reflect.String, reflect.Map, reflect.Array, reflect.Slice:
+					f.isEmpty = func(va addressableValue) bool { return va.Len() == 0 }
+				case reflect.Pointer, reflect.Interface:
+					f.isEmpty = func(va addressableValue) bool { return va.IsNil() }
+				}
+
+				f.id = len(fs.flattened)
+				f.fncs = lookupArshaler(sf.Type)
+				fs.flattened = append(fs.flattened, f)
+
+				// Reject user-specified names with invalid UTF-8.
+				if !utf8.ValidString(f.name) {
+					err := fmt.Errorf("Go struct field %s has JSON object name %q with invalid UTF-8", sf.Name, f.name)
+					return structFields{}, &SemanticError{GoType: t, Err: err}
+				}
+				// Reject multiple fields with same name within the same struct.
+				if j, ok := namesIndex[f.name]; ok {
+					err := fmt.Errorf("Go struct fields %s and %s conflict over JSON object name %q", t.Field(j).Name, sf.Name, f.name)
+					return structFields{}, &SemanticError{GoType: t, Err: err}
+				}
+				namesIndex[f.name] = i
+
+				// Multiple fields of the same name across different structs
+				// follow the same precedence rules as Go struct embedding.
+				if f2 := fs.byActualName[f.name]; f2 == nil {
+					fs.byActualName[f.name] = &fs.flattened[len(fs.flattened)-1] // store first occurrence at lowest depth
+				} else if len(f2.index) == len(f.index) {
+					fs.byActualName[f.name] = ambiguous // at least two occurrences at same depth
+				}
+			}
+		}
+
+		// NOTE: New users to the json package are occasionally surprised that
+		// unexported fields are ignored. This occurs by necessity due to our
+		// inability to directly introspect such fields with Go reflection
+		// without the use of unsafe.
+		//
+		// To reduce friction here, refuse to serialize any Go struct that
+		// has no JSON serializable fields, has at least one Go struct field,
+		// and does not have any `json` tags present. For example,
+		// errors returned by errors.New would fail to serialize.
+		isEmptyStruct := t.NumField() == 0
+		if !isEmptyStruct && !hasAnyJSONTag && !hasAnyJSONField {
+			err := errors.New("Go struct has no exported fields")
+			return structFields{}, &SemanticError{GoType: t, Err: err}
+		}
+	}
+
+	// Remove all fields that are duplicates.
+	// This may move elements forward to fill the holes from removed fields.
+	var n int
+	for _, f := range fs.flattened {
+		switch f2 := fs.byActualName[f.name]; {
+		case f2 == ambiguous:
+			delete(fs.byActualName, f.name)
+		case f2 == nil:
+			continue // may be nil due to previous delete
+		// TODO(https://go.dev/issue/45955): Use slices.Equal.
+		case reflect.DeepEqual(f.index, f2.index):
+			f.id = n
+			fs.flattened[n] = f
+			fs.byActualName[f.name] = &fs.flattened[n] // fix pointer to new location
+			n++
+		}
+	}
+	fs.flattened = fs.flattened[:n]
+	if fs.inlinedFallback == ambiguous {
+		fs.inlinedFallback = nil
+	}
+	if len(fs.flattened) != len(fs.byActualName) {
+		panic(fmt.Sprintf("BUG: flattened list of fields mismatches fields mapped by name: %d != %d", len(fs.flattened), len(fs.byActualName)))
+	}
+
+	// Sort the fields according to a depth-first ordering.
+	// This operation will cause pointers in byActualName to become incorrect,
+	// which we will correct in another loop shortly thereafter.
+	sort.Slice(fs.flattened, func(i, j int) bool {
+		si := fs.flattened[i].index
+		sj := fs.flattened[j].index
+		for len(si) > 0 && len(sj) > 0 {
+			switch {
+			case si[0] < sj[0]:
+				return true
+			case si[0] > sj[0]:
+				return false
+			default:
+				si = si[1:]
+				sj = sj[1:]
+			}
+		}
+		return len(si) < len(sj)
+	})
+
+	// Recompute the mapping of fields in the byActualName map.
+	// Pre-fold all names so that we can lookup folded names quickly.
+	for i, f := range fs.flattened {
+		foldedName := string(foldName([]byte(f.name)))
+		fs.byActualName[f.name] = &fs.flattened[i]
+		fs.byFoldedName[foldedName] = append(fs.byFoldedName[foldedName], &fs.flattened[i])
+	}
+	for foldedName, fields := range fs.byFoldedName {
+		if len(fields) > 1 {
+			// The precedence order for conflicting nocase names
+			// is by breadth-first order, rather than depth-first order.
+			sort.Slice(fields, func(i, j int) bool {
+				return fields[i].id < fields[j].id
+			})
+			fs.byFoldedName[foldedName] = fields
+		}
+	}
+
+	return fs, nil
+}
+
+type fieldOptions struct {
+	name       string
+	quotedName string // quoted name per RFC 8785, section 3.2.2.2.
+	hasName    bool
+	nocase     bool
+	inline     bool
+	unknown    bool
+	omitzero   bool
+	omitempty  bool
+	string     bool
+	format     string
+}
+
+// parseFieldOptions parses the `json` tag in a Go struct field as
+// a structured set of options configuring parameters such as
+// the JSON member name and other features.
+// As a special case, it returns errIgnoredField if the field is ignored.
+func parseFieldOptions(sf reflect.StructField) (out fieldOptions, err error) {
+	tag, hasTag := sf.Tag.Lookup("json")
+
+	// Check whether this field is explicitly ignored.
+	if tag == "-" {
+		return fieldOptions{}, errIgnoredField
+	}
+
+	// Check whether this field is unexported.
+	if !sf.IsExported() {
+		// In contrast to v1, v2 no longer forwards exported fields from
+		// embedded fields of unexported types since Go reflection does not
+		// allow the same set of operations that are available in normal cases
+		// of purely exported fields.
+		// See https://go.dev/issue/21357 and https://go.dev/issue/24153.
+		if sf.Anonymous {
+			return fieldOptions{}, fmt.Errorf("embedded Go struct field %s of an unexported type must be explicitly ignored with a `json:\"-\"` tag", sf.Type.Name())
+		}
+		// Tag options specified on an unexported field suggests user error.
+		if hasTag {
+			return fieldOptions{}, fmt.Errorf("unexported Go struct field %s cannot have non-ignored `json:%q` tag", sf.Name, tag)
+		}
+		return fieldOptions{}, errIgnoredField
+	}
+
+	// Determine the JSON member name for this Go field. A user-specified name
+	// may be provided as either an identifier or a single-quoted string.
+	// The single-quoted string allows arbitrary characters in the name.
+	// See https://go.dev/issue/2718 and https://go.dev/issue/3546.
+	out.name = sf.Name // always starts with an uppercase character
+	if len(tag) > 0 && !strings.HasPrefix(tag, ",") {
+		// For better compatibility with v1, accept almost any unescaped name.
+		n := len(tag) - len(strings.TrimLeftFunc(tag, func(r rune) bool {
+			return !strings.ContainsRune(",\\'\"`", r) // reserve comma, backslash, and quotes
+		}))
+		opt := tag[:n]
+		if n == 0 {
+			// Allow a single quoted string for arbitrary names.
+			opt, n, err = consumeTagOption(tag)
+			if err != nil {
+				return fieldOptions{}, fmt.Errorf("Go struct field %s has malformed `json` tag: %v", sf.Name, err)
+			}
+		}
+		out.hasName = true
+		out.name = opt
+		tag = tag[n:]
+	}
+	b, _ := appendString(nil, out.name, false, nil)
+	out.quotedName = string(b)
+
+	// Handle any additional tag options (if any).
+	var wasFormat bool
+	seenOpts := make(map[string]bool)
+	for len(tag) > 0 {
+		// Consume comma delimiter.
+		if tag[0] != ',' {
+			return fieldOptions{}, fmt.Errorf("Go struct field %s has malformed `json` tag: invalid character %q before next option (expecting ',')", sf.Name, tag[0])
+		}
+		tag = tag[len(","):]
+		if len(tag) == 0 {
+			return fieldOptions{}, fmt.Errorf("Go struct field %s has malformed `json` tag: invalid trailing ',' character", sf.Name)
+		}
+
+		// Consume and process the tag option.
+		opt, n, err := consumeTagOption(tag)
+		if err != nil {
+			return fieldOptions{}, fmt.Errorf("Go struct field %s has malformed `json` tag: %v", sf.Name, err)
+		}
+		rawOpt := tag[:n]
+		tag = tag[n:]
+		switch {
+		case wasFormat:
+			return fieldOptions{}, fmt.Errorf("Go struct field %s has `format` tag option that was not specified last", sf.Name)
+		case strings.HasPrefix(rawOpt, "'") && strings.TrimFunc(opt, isLetterOrDigit) == "":
+			return fieldOptions{}, fmt.Errorf("Go struct field %s has unnecessarily quoted appearance of `%s` tag option; specify `%s` instead", sf.Name, rawOpt, opt)
+		}
+		switch opt {
+		case "nocase":
+			out.nocase = true
+		case "inline":
+			out.inline = true
+		case "unknown":
+			out.unknown = true
+		case "omitzero":
+			out.omitzero = true
+		case "omitempty":
+			out.omitempty = true
+		case "string":
+			out.string = true
+		case "format":
+			if !strings.HasPrefix(tag, ":") {
+				return fieldOptions{}, fmt.Errorf("Go struct field %s is missing value for `format` tag option", sf.Name)
+			}
+			tag = tag[len(":"):]
+			opt, n, err := consumeTagOption(tag)
+			if err != nil {
+				return fieldOptions{}, fmt.Errorf("Go struct field %s has malformed value for `format` tag option: %v", sf.Name, err)
+			}
+			tag = tag[n:]
+			out.format = opt
+			wasFormat = true
+		default:
+			// Reject keys that resemble one of the supported options.
+			// This catches invalid mutants such as "omitEmpty" or "omit_empty".
+			normOpt := strings.ReplaceAll(strings.ToLower(opt), "_", "")
+			switch normOpt {
+			case "nocase", "inline", "unknown", "omitzero", "omitempty", "string", "format":
+				return fieldOptions{}, fmt.Errorf("Go struct field %s has invalid appearance of `%s` tag option; specify `%s` instead", sf.Name, opt, normOpt)
+			}
+
+			// NOTE: Everything else is ignored. This does not mean it is
+			// forward compatible to insert arbitrary tag options since
+			// a future version of this package may understand that tag.
+		}
+
+		// Reject duplicates.
+		if seenOpts[opt] {
+			return fieldOptions{}, fmt.Errorf("Go struct field %s has duplicate appearance of `%s` tag option", sf.Name, rawOpt)
+		}
+		seenOpts[opt] = true
+	}
+	return out, nil
+}
+
+func consumeTagOption(in string) (string, int, error) {
+	switch r, _ := utf8.DecodeRuneInString(in); {
+	// Option as a Go identifier.
+	case r == '_' || unicode.IsLetter(r):
+		n := len(in) - len(strings.TrimLeftFunc(in, isLetterOrDigit))
+		return in[:n], n, nil
+	// Option as a single-quoted string.
+	case r == '\'':
+		// The grammar is nearly identical to a double-quoted Go string literal,
+		// but uses single quotes as the terminators. The reason for a custom
+		// grammar is because both backtick and double quotes cannot be used
+		// verbatim in a struct tag.
+		//
+		// Convert a single-quoted string to a double-quote string and rely on
+		// strconv.Unquote to handle the rest.
+		var inEscape bool
+		b := []byte{'"'}
+		n := len(`'`)
+		for len(in) > n {
+			r, rn := utf8.DecodeRuneInString(in[n:])
+			switch {
+			case inEscape:
+				if r == '\'' {
+					b = b[:len(b)-1] // remove escape character: `\'` => `'`
+				}
+				inEscape = false
+			case r == '\\':
+				inEscape = true
+			case r == '"':
+				b = append(b, '\\') // insert escape character: `"` => `\"`
+			case r == '\'':
+				b = append(b, '"')
+				n += len(`'`)
+				out, err := strconv.Unquote(string(b))
+				if err != nil {
+					return "", 0, fmt.Errorf("invalid single-quoted string: %s", in[:n])
+				}
+				return out, n, nil
+			}
+			b = append(b, in[n:][:rn]...)
+			n += rn
+		}
+		if n > 10 {
+			n = 10 // limit the amount of context printed in the error
+		}
+		return "", 0, fmt.Errorf("single-quoted string not terminated: %s...", in[:n])
+	case len(in) == 0:
+		return "", 0, io.ErrUnexpectedEOF
+	default:
+		return "", 0, fmt.Errorf("invalid character %q at start of option (expecting Unicode letter or single quote)", r)
+	}
+}
+
+func isLetterOrDigit(r rune) bool {
+	return r == '_' || unicode.IsLetter(r) || unicode.IsNumber(r)
+}

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/fold.go

@@ -0,0 +1,56 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"unicode"
+	"unicode/utf8"
+)
+
+// foldName returns a folded string such that foldName(x) == foldName(y)
+// is similar to strings.EqualFold(x, y), but ignores underscore and dashes.
+// This allows foldName to match common naming conventions.
+func foldName(in []byte) []byte {
+	// This is inlinable to take advantage of "function outlining".
+	// See https://blog.filippo.io/efficient-go-apis-with-the-inliner/
+	var arr [32]byte // large enough for most JSON names
+	return appendFoldedName(arr[:0], in)
+}
+func appendFoldedName(out, in []byte) []byte {
+	for i := 0; i < len(in); {
+		// Handle single-byte ASCII.
+		if c := in[i]; c < utf8.RuneSelf {
+			if c != '_' && c != '-' {
+				if 'a' <= c && c <= 'z' {
+					c -= 'a' - 'A'
+				}
+				out = append(out, c)
+			}
+			i++
+			continue
+		}
+		// Handle multi-byte Unicode.
+		r, n := utf8.DecodeRune(in[i:])
+		out = utf8.AppendRune(out, foldRune(r))
+		i += n
+	}
+	return out
+}
+
+// foldRune is a variation on unicode.SimpleFold that returns the same rune
+// for all runes in the same fold set.
+//
+// Invariant:
+//
+//	foldRune(x) == foldRune(y) ⇔ strings.EqualFold(string(x), string(y))
+func foldRune(r rune) rune {
+	for {
+		r2 := unicode.SimpleFold(r)
+		if r2 <= r {
+			return r2 // smallest character in the fold set
+		}
+		r = r2
+	}
+}

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/intern.go

@@ -0,0 +1,86 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"encoding/binary"
+	"math/bits"
+)
+
+// stringCache is a cache for strings converted from a []byte.
+type stringCache [256]string // 256*unsafe.Sizeof(string("")) => 4KiB
+
+// make returns the string form of b.
+// It returns a pre-allocated string from c if present, otherwise
+// it allocates a new string, inserts it into the cache, and returns it.
+func (c *stringCache) make(b []byte) string {
+	const (
+		minCachedLen = 2   // single byte strings are already interned by the runtime
+		maxCachedLen = 256 // large enough for UUIDs, IPv6 addresses, SHA-256 checksums, etc.
+	)
+	if c == nil || len(b) < minCachedLen || len(b) > maxCachedLen {
+		return string(b)
+	}
+
+	// Compute a hash from the fixed-width prefix and suffix of the string.
+	// This ensures hashing a string is a constant time operation.
+	var h uint32
+	switch {
+	case len(b) >= 8:
+		lo := binary.LittleEndian.Uint64(b[:8])
+		hi := binary.LittleEndian.Uint64(b[len(b)-8:])
+		h = hash64(uint32(lo), uint32(lo>>32)) ^ hash64(uint32(hi), uint32(hi>>32))
+	case len(b) >= 4:
+		lo := binary.LittleEndian.Uint32(b[:4])
+		hi := binary.LittleEndian.Uint32(b[len(b)-4:])
+		h = hash64(lo, hi)
+	case len(b) >= 2:
+		lo := binary.LittleEndian.Uint16(b[:2])
+		hi := binary.LittleEndian.Uint16(b[len(b)-2:])
+		h = hash64(uint32(lo), uint32(hi))
+	}
+
+	// Check the cache for the string.
+	i := h % uint32(len(*c))
+	if s := (*c)[i]; s == string(b) {
+		return s
+	}
+	s := string(b)
+	(*c)[i] = s
+	return s
+}
+
+// hash64 returns the hash of two uint32s as a single uint32.
+func hash64(lo, hi uint32) uint32 {
+	// If avalanche=true, this is identical to XXH32 hash on a 8B string:
+	//	var b [8]byte
+	//	binary.LittleEndian.PutUint32(b[:4], lo)
+	//	binary.LittleEndian.PutUint32(b[4:], hi)
+	//	return xxhash.Sum32(b[:])
+	const (
+		prime1 = 0x9e3779b1
+		prime2 = 0x85ebca77
+		prime3 = 0xc2b2ae3d
+		prime4 = 0x27d4eb2f
+		prime5 = 0x165667b1
+	)
+	h := prime5 + uint32(8)
+	h += lo * prime3
+	h = bits.RotateLeft32(h, 17) * prime4
+	h += hi * prime3
+	h = bits.RotateLeft32(h, 17) * prime4
+	// Skip final mix (avalanche) step of XXH32 for performance reasons.
+	// Empirical testing shows that the improvements in unbiased distribution
+	// does not outweigh the extra cost in computational complexity.
+	const avalanche = false
+	if avalanche {
+		h ^= h >> 15
+		h *= prime2
+		h ^= h >> 13
+		h *= prime3
+		h ^= h >> 16
+	}
+	return h
+}

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/pools.go

@@ -0,0 +1,150 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"bytes"
+	"io"
+	"math/bits"
+	"sync"
+)
+
+// TODO(https://go.dev/issue/47657): Use sync.PoolOf.
+
+var (
+	// This owns the internal buffer since there is no io.Writer to output to.
+	// Since the buffer can get arbitrarily large in normal usage,
+	// there is statistical tracking logic to determine whether to recycle
+	// the internal buffer or not based on a history of utilization.
+	bufferedEncoderPool = &sync.Pool{New: func() any { return new(Encoder) }}
+
+	// This owns the internal buffer, but it is only used to temporarily store
+	// buffered JSON before flushing it to the underlying io.Writer.
+	// In a sufficiently efficient streaming mode, we do not expect the buffer
+	// to grow arbitrarily large. Thus, we avoid recycling large buffers.
+	streamingEncoderPool = &sync.Pool{New: func() any { return new(Encoder) }}
+
+	// This does not own the internal buffer since
+	// it is taken directly from the provided bytes.Buffer.
+	bytesBufferEncoderPool = &sync.Pool{New: func() any { return new(Encoder) }}
+)
+
+// bufferStatistics is statistics to track buffer utilization.
+// It is used to determine whether to recycle a buffer or not
+// to avoid https://go.dev/issue/23199.
+type bufferStatistics struct {
+	strikes int // number of times the buffer was under-utilized
+	prevLen int // length of previous buffer
+}
+
+func getBufferedEncoder(o EncodeOptions) *Encoder {
+	e := bufferedEncoderPool.Get().(*Encoder)
+	if e.buf == nil {
+		// Round up to nearest 2ⁿ to make best use of malloc size classes.
+		// See runtime/sizeclasses.go on Go1.15.
+		// Logical OR with 63 to ensure 64 as the minimum buffer size.
+		n := 1 << bits.Len(uint(e.bufStats.prevLen|63))
+		e.buf = make([]byte, 0, n)
+	}
+	e.reset(e.buf[:0], nil, o)
+	return e
+}
+func putBufferedEncoder(e *Encoder) {
+	// Recycle large buffers only if sufficiently utilized.
+	// If a buffer is under-utilized enough times sequentially,
+	// then it is discarded, ensuring that a single large buffer
+	// won't be kept alive by a continuous stream of small usages.
+	//
+	// The worst case utilization is computed as:
+	//	MIN_UTILIZATION_THRESHOLD / (1 + MAX_NUM_STRIKES)
+	//
+	// For the constants chosen below, this is (25%)/(1+4) ⇒ 5%.
+	// This may seem low, but it ensures a lower bound on
+	// the absolute worst-case utilization. Without this check,
+	// this would be theoretically 0%, which is infinitely worse.
+	//
+	// See https://go.dev/issue/27735.
+	switch {
+	case cap(e.buf) <= 4<<10: // always recycle buffers smaller than 4KiB
+		e.bufStats.strikes = 0
+	case cap(e.buf)/4 <= len(e.buf): // at least 25% utilization
+		e.bufStats.strikes = 0
+	case e.bufStats.strikes < 4: // at most 4 strikes
+		e.bufStats.strikes++
+	default: // discard the buffer; too large and too often under-utilized
+		e.bufStats.strikes = 0
+		e.bufStats.prevLen = len(e.buf) // heuristic for size to allocate next time
+		e.buf = nil
+	}
+	bufferedEncoderPool.Put(e)
+}
+
+func getStreamingEncoder(w io.Writer, o EncodeOptions) *Encoder {
+	if _, ok := w.(*bytes.Buffer); ok {
+		e := bytesBufferEncoderPool.Get().(*Encoder)
+		e.reset(nil, w, o) // buffer taken from bytes.Buffer
+		return e
+	} else {
+		e := streamingEncoderPool.Get().(*Encoder)
+		e.reset(e.buf[:0], w, o) // preserve existing buffer
+		return e
+	}
+}
+func putStreamingEncoder(e *Encoder) {
+	if _, ok := e.wr.(*bytes.Buffer); ok {
+		bytesBufferEncoderPool.Put(e)
+	} else {
+		if cap(e.buf) > 64<<10 {
+			e.buf = nil // avoid pinning arbitrarily large amounts of memory
+		}
+		streamingEncoderPool.Put(e)
+	}
+}
+
+var (
+	// This does not own the internal buffer since it is externally provided.
+	bufferedDecoderPool = &sync.Pool{New: func() any { return new(Decoder) }}
+
+	// This owns the internal buffer, but it is only used to temporarily store
+	// buffered JSON fetched from the underlying io.Reader.
+	// In a sufficiently efficient streaming mode, we do not expect the buffer
+	// to grow arbitrarily large. Thus, we avoid recycling large buffers.
+	streamingDecoderPool = &sync.Pool{New: func() any { return new(Decoder) }}
+
+	// This does not own the internal buffer since
+	// it is taken directly from the provided bytes.Buffer.
+	bytesBufferDecoderPool = bufferedDecoderPool
+)
+
+func getBufferedDecoder(b []byte, o DecodeOptions) *Decoder {
+	d := bufferedDecoderPool.Get().(*Decoder)
+	d.reset(b, nil, o)
+	return d
+}
+func putBufferedDecoder(d *Decoder) {
+	bufferedDecoderPool.Put(d)
+}
+
+func getStreamingDecoder(r io.Reader, o DecodeOptions) *Decoder {
+	if _, ok := r.(*bytes.Buffer); ok {
+		d := bytesBufferDecoderPool.Get().(*Decoder)
+		d.reset(nil, r, o) // buffer taken from bytes.Buffer
+		return d
+	} else {
+		d := streamingDecoderPool.Get().(*Decoder)
+		d.reset(d.buf[:0], r, o) // preserve existing buffer
+		return d
+	}
+}
+func putStreamingDecoder(d *Decoder) {
+	if _, ok := d.rd.(*bytes.Buffer); ok {
+		bytesBufferDecoderPool.Put(d)
+	} else {
+		if cap(d.buf) > 64<<10 {
+			d.buf = nil // avoid pinning arbitrarily large amounts of memory
+		}
+		streamingDecoderPool.Put(d)
+	}
+}

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/state.go

@@ -0,0 +1,747 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"math"
+	"strconv"
+)
+
+var (
+	errMissingName   = &SyntacticError{str: "missing string for object name"}
+	errMissingColon  = &SyntacticError{str: "missing character ':' after object name"}
+	errMissingValue  = &SyntacticError{str: "missing value after object name"}
+	errMissingComma  = &SyntacticError{str: "missing character ',' after object or array value"}
+	errMismatchDelim = &SyntacticError{str: "mismatching structural token for object or array"}
+)
+
+const errInvalidNamespace = jsonError("object namespace is in an invalid state")
+
+type state struct {
+	// tokens validates whether the next token kind is valid.
+	tokens stateMachine
+
+	// names is a stack of object names.
+	// Not used if AllowDuplicateNames is true.
+	names objectNameStack
+
+	// namespaces is a stack of object namespaces.
+	// For performance reasons, Encoder or Decoder may not update this
+	// if Marshal or Unmarshal is able to track names in a more efficient way.
+	// See makeMapArshaler and makeStructArshaler.
+	// Not used if AllowDuplicateNames is true.
+	namespaces objectNamespaceStack
+}
+
+func (s *state) reset() {
+	s.tokens.reset()
+	s.names.reset()
+	s.namespaces.reset()
+}
+
+// appendStackPointer appends a JSON Pointer (RFC 6901) to the current value.
+// The returned pointer is only accurate if s.names is populated,
+// otherwise it uses the numeric index as the object member name.
+//
+// Invariant: Must call s.names.copyQuotedBuffer beforehand.
+func (s state) appendStackPointer(b []byte) []byte {
+	var objectDepth int
+	for i := 1; i < s.tokens.depth(); i++ {
+		e := s.tokens.index(i)
+		if e.length() == 0 {
+			break // empty object or array
+		}
+		b = append(b, '/')
+		switch {
+		case e.isObject():
+			if objectDepth < s.names.length() {
+				for _, c := range s.names.getUnquoted(objectDepth) {
+					// Per RFC 6901, section 3, escape '~' and '/' characters.
+					switch c {
+					case '~':
+						b = append(b, "~0"...)
+					case '/':
+						b = append(b, "~1"...)
+					default:
+						b = append(b, c)
+					}
+				}
+			} else {
+				// Since the names stack is unpopulated, the name is unknown.
+				// As a best-effort replacement, use the numeric member index.
+				// While inaccurate, it produces a syntactically valid pointer.
+				b = strconv.AppendUint(b, uint64((e.length()-1)/2), 10)
+			}
+			objectDepth++
+		case e.isArray():
+			b = strconv.AppendUint(b, uint64(e.length()-1), 10)
+		}
+	}
+	return b
+}
+
+// stateMachine is a push-down automaton that validates whether
+// a sequence of tokens is valid or not according to the JSON grammar.
+// It is useful for both encoding and decoding.
+//
+// It is a stack where each entry represents a nested JSON object or array.
+// The stack has a minimum depth of 1 where the first level is a
+// virtual JSON array to handle a stream of top-level JSON values.
+// The top-level virtual JSON array is special in that it doesn't require commas
+// between each JSON value.
+//
+// For performance, most methods are carefully written to be inlineable.
+// The zero value is a valid state machine ready for use.
+type stateMachine struct {
+	stack []stateEntry
+	last  stateEntry
+}
+
+// reset resets the state machine.
+// The machine always starts with a minimum depth of 1.
+func (m *stateMachine) reset() {
+	m.stack = m.stack[:0]
+	if cap(m.stack) > 1<<10 {
+		m.stack = nil
+	}
+	m.last = stateTypeArray
+}
+
+// depth is the current nested depth of JSON objects and arrays.
+// It is one-indexed (i.e., top-level values have a depth of 1).
+func (m stateMachine) depth() int {
+	return len(m.stack) + 1
+}
+
+// index returns a reference to the ith entry.
+// It is only valid until the next push method call.
+func (m *stateMachine) index(i int) *stateEntry {
+	if i == len(m.stack) {
+		return &m.last
+	}
+	return &m.stack[i]
+}
+
+// depthLength reports the current nested depth and
+// the length of the last JSON object or array.
+func (m stateMachine) depthLength() (int, int) {
+	return m.depth(), m.last.length()
+}
+
+// appendLiteral appends a JSON literal as the next token in the sequence.
+// If an error is returned, the state is not mutated.
+func (m *stateMachine) appendLiteral() error {
+	switch {
+	case m.last.needObjectName():
+		return errMissingName
+	case !m.last.isValidNamespace():
+		return errInvalidNamespace
+	default:
+		m.last.increment()
+		return nil
+	}
+}
+
+// appendString appends a JSON string as the next token in the sequence.
+// If an error is returned, the state is not mutated.
+func (m *stateMachine) appendString() error {
+	switch {
+	case !m.last.isValidNamespace():
+		return errInvalidNamespace
+	default:
+		m.last.increment()
+		return nil
+	}
+}
+
+// appendNumber appends a JSON number as the next token in the sequence.
+// If an error is returned, the state is not mutated.
+func (m *stateMachine) appendNumber() error {
+	return m.appendLiteral()
+}
+
+// pushObject appends a JSON start object token as next in the sequence.
+// If an error is returned, the state is not mutated.
+func (m *stateMachine) pushObject() error {
+	switch {
+	case m.last.needObjectName():
+		return errMissingName
+	case !m.last.isValidNamespace():
+		return errInvalidNamespace
+	default:
+		m.last.increment()
+		m.stack = append(m.stack, m.last)
+		m.last = stateTypeObject
+		return nil
+	}
+}
+
+// popObject appends a JSON end object token as next in the sequence.
+// If an error is returned, the state is not mutated.
+func (m *stateMachine) popObject() error {
+	switch {
+	case !m.last.isObject():
+		return errMismatchDelim
+	case m.last.needObjectValue():
+		return errMissingValue
+	case !m.last.isValidNamespace():
+		return errInvalidNamespace
+	default:
+		m.last = m.stack[len(m.stack)-1]
+		m.stack = m.stack[:len(m.stack)-1]
+		return nil
+	}
+}
+
+// pushArray appends a JSON start array token as next in the sequence.
+// If an error is returned, the state is not mutated.
+func (m *stateMachine) pushArray() error {
+	switch {
+	case m.last.needObjectName():
+		return errMissingName
+	case !m.last.isValidNamespace():
+		return errInvalidNamespace
+	default:
+		m.last.increment()
+		m.stack = append(m.stack, m.last)
+		m.last = stateTypeArray
+		return nil
+	}
+}
+
+// popArray appends a JSON end array token as next in the sequence.
+// If an error is returned, the state is not mutated.
+func (m *stateMachine) popArray() error {
+	switch {
+	case !m.last.isArray() || len(m.stack) == 0: // forbid popping top-level virtual JSON array
+		return errMismatchDelim
+	case !m.last.isValidNamespace():
+		return errInvalidNamespace
+	default:
+		m.last = m.stack[len(m.stack)-1]
+		m.stack = m.stack[:len(m.stack)-1]
+		return nil
+	}
+}
+
+// needIndent reports whether indent whitespace should be injected.
+// A zero value means that no whitespace should be injected.
+// A positive value means '\n', indentPrefix, and (n-1) copies of indentBody
+// should be appended to the output immediately before the next token.
+func (m stateMachine) needIndent(next Kind) (n int) {
+	willEnd := next == '}' || next == ']'
+	switch {
+	case m.depth() == 1:
+		return 0 // top-level values are never indented
+	case m.last.length() == 0 && willEnd:
+		return 0 // an empty object or array is never indented
+	case m.last.length() == 0 || m.last.needImplicitComma(next):
+		return m.depth()
+	case willEnd:
+		return m.depth() - 1
+	default:
+		return 0
+	}
+}
+
+// mayAppendDelim appends a colon or comma that may precede the next token.
+func (m stateMachine) mayAppendDelim(b []byte, next Kind) []byte {
+	switch {
+	case m.last.needImplicitColon():
+		return append(b, ':')
+	case m.last.needImplicitComma(next) && len(m.stack) != 0: // comma not needed for top-level values
+		return append(b, ',')
+	default:
+		return b
+	}
+}
+
+// needDelim reports whether a colon or comma token should be implicitly emitted
+// before the next token of the specified kind.
+// A zero value means no delimiter should be emitted.
+func (m stateMachine) needDelim(next Kind) (delim byte) {
+	switch {
+	case m.last.needImplicitColon():
+		return ':'
+	case m.last.needImplicitComma(next) && len(m.stack) != 0: // comma not needed for top-level values
+		return ','
+	default:
+		return 0
+	}
+}
+
+// checkDelim reports whether the specified delimiter should be there given
+// the kind of the next token that appears immediately afterwards.
+func (m stateMachine) checkDelim(delim byte, next Kind) error {
+	switch needDelim := m.needDelim(next); {
+	case needDelim == delim:
+		return nil
+	case needDelim == ':':
+		return errMissingColon
+	case needDelim == ',':
+		return errMissingComma
+	default:
+		return newInvalidCharacterError([]byte{delim}, "before next token")
+	}
+}
+
+// invalidateDisabledNamespaces marks all disabled namespaces as invalid.
+//
+// For efficiency, Marshal and Unmarshal may disable namespaces since there are
+// more efficient ways to track duplicate names. However, if an error occurs,
+// the namespaces in Encoder or Decoder will be left in an inconsistent state.
+// Mark the namespaces as invalid so that future method calls on
+// Encoder or Decoder will return an error.
+func (m *stateMachine) invalidateDisabledNamespaces() {
+	for i := 0; i < m.depth(); i++ {
+		e := m.index(i)
+		if !e.isActiveNamespace() {
+			e.invalidateNamespace()
+		}
+	}
+}
+
+// stateEntry encodes several artifacts within a single unsigned integer:
+//   - whether this represents a JSON object or array,
+//   - whether this object should check for duplicate names, and
+//   - how many elements are in this JSON object or array.
+type stateEntry uint64
+
+const (
+	// The type mask (1 bit) records whether this is a JSON object or array.
+	stateTypeMask   stateEntry = 0x8000_0000_0000_0000
+	stateTypeObject stateEntry = 0x8000_0000_0000_0000
+	stateTypeArray  stateEntry = 0x0000_0000_0000_0000
+
+	// The name check mask (2 bit) records whether to update
+	// the namespaces for the current JSON object and
+	// whether the namespace is valid.
+	stateNamespaceMask    stateEntry = 0x6000_0000_0000_0000
+	stateDisableNamespace stateEntry = 0x4000_0000_0000_0000
+	stateInvalidNamespace stateEntry = 0x2000_0000_0000_0000
+
+	// The count mask (61 bits) records the number of elements.
+	stateCountMask    stateEntry = 0x1fff_ffff_ffff_ffff
+	stateCountLSBMask stateEntry = 0x0000_0000_0000_0001
+	stateCountOdd     stateEntry = 0x0000_0000_0000_0001
+	stateCountEven    stateEntry = 0x0000_0000_0000_0000
+)
+
+// length reports the number of elements in the JSON object or array.
+// Each name and value in an object entry is treated as a separate element.
+func (e stateEntry) length() int {
+	return int(e & stateCountMask)
+}
+
+// isObject reports whether this is a JSON object.
+func (e stateEntry) isObject() bool {
+	return e&stateTypeMask == stateTypeObject
+}
+
+// isArray reports whether this is a JSON array.
+func (e stateEntry) isArray() bool {
+	return e&stateTypeMask == stateTypeArray
+}
+
+// needObjectName reports whether the next token must be a JSON string,
+// which is necessary for JSON object names.
+func (e stateEntry) needObjectName() bool {
+	return e&(stateTypeMask|stateCountLSBMask) == stateTypeObject|stateCountEven
+}
+
+// needImplicitColon reports whether an colon should occur next,
+// which always occurs after JSON object names.
+func (e stateEntry) needImplicitColon() bool {
+	return e.needObjectValue()
+}
+
+// needObjectValue reports whether the next token must be a JSON value,
+// which is necessary after every JSON object name.
+func (e stateEntry) needObjectValue() bool {
+	return e&(stateTypeMask|stateCountLSBMask) == stateTypeObject|stateCountOdd
+}
+
+// needImplicitComma reports whether an comma should occur next,
+// which always occurs after a value in a JSON object or array
+// before the next value (or name).
+func (e stateEntry) needImplicitComma(next Kind) bool {
+	return !e.needObjectValue() && e.length() > 0 && next != '}' && next != ']'
+}
+
+// increment increments the number of elements for the current object or array.
+// This assumes that overflow won't practically be an issue since
+// 1<<bits.OnesCount(stateCountMask) is sufficiently large.
+func (e *stateEntry) increment() {
+	(*e)++
+}
+
+// decrement decrements the number of elements for the current object or array.
+// It is the callers responsibility to ensure that e.length > 0.
+func (e *stateEntry) decrement() {
+	(*e)--
+}
+
+// disableNamespace disables the JSON object namespace such that the
+// Encoder or Decoder no longer updates the namespace.
+func (e *stateEntry) disableNamespace() {
+	*e |= stateDisableNamespace
+}
+
+// isActiveNamespace reports whether the JSON object namespace is actively
+// being updated and used for duplicate name checks.
+func (e stateEntry) isActiveNamespace() bool {
+	return e&(stateDisableNamespace) == 0
+}
+
+// invalidateNamespace marks the JSON object namespace as being invalid.
+func (e *stateEntry) invalidateNamespace() {
+	*e |= stateInvalidNamespace
+}
+
+// isValidNamespace reports whether the JSON object namespace is valid.
+func (e stateEntry) isValidNamespace() bool {
+	return e&(stateInvalidNamespace) == 0
+}
+
+// objectNameStack is a stack of names when descending into a JSON object.
+// In contrast to objectNamespaceStack, this only has to remember a single name
+// per JSON object.
+//
+// This data structure may contain offsets to encodeBuffer or decodeBuffer.
+// It violates clean abstraction of layers, but is significantly more efficient.
+// This ensures that popping and pushing in the common case is a trivial
+// push/pop of an offset integer.
+//
+// The zero value is an empty names stack ready for use.
+type objectNameStack struct {
+	// offsets is a stack of offsets for each name.
+	// A non-negative offset is the ending offset into the local names buffer.
+	// A negative offset is the bit-wise inverse of a starting offset into
+	// a remote buffer (e.g., encodeBuffer or decodeBuffer).
+	// A math.MinInt offset at the end implies that the last object is empty.
+	// Invariant: Positive offsets always occur before negative offsets.
+	offsets []int
+	// unquotedNames is a back-to-back concatenation of names.
+	unquotedNames []byte
+}
+
+func (ns *objectNameStack) reset() {
+	ns.offsets = ns.offsets[:0]
+	ns.unquotedNames = ns.unquotedNames[:0]
+	if cap(ns.offsets) > 1<<6 {
+		ns.offsets = nil // avoid pinning arbitrarily large amounts of memory
+	}
+	if cap(ns.unquotedNames) > 1<<10 {
+		ns.unquotedNames = nil // avoid pinning arbitrarily large amounts of memory
+	}
+}
+
+func (ns *objectNameStack) length() int {
+	return len(ns.offsets)
+}
+
+// getUnquoted retrieves the ith unquoted name in the namespace.
+// It returns an empty string if the last object is empty.
+//
+// Invariant: Must call copyQuotedBuffer beforehand.
+func (ns *objectNameStack) getUnquoted(i int) []byte {
+	ns.ensureCopiedBuffer()
+	if i == 0 {
+		return ns.unquotedNames[:ns.offsets[0]]
+	} else {
+		return ns.unquotedNames[ns.offsets[i-1]:ns.offsets[i-0]]
+	}
+}
+
+// invalidOffset indicates that the last JSON object currently has no name.
+const invalidOffset = math.MinInt
+
+// push descends into a nested JSON object.
+func (ns *objectNameStack) push() {
+	ns.offsets = append(ns.offsets, invalidOffset)
+}
+
+// replaceLastQuotedOffset replaces the last name with the starting offset
+// to the quoted name in some remote buffer. All offsets provided must be
+// relative to the same buffer until copyQuotedBuffer is called.
+func (ns *objectNameStack) replaceLastQuotedOffset(i int) {
+	// Use bit-wise inversion instead of naive multiplication by -1 to avoid
+	// ambiguity regarding zero (which is a valid offset into the names field).
+	// Bit-wise inversion is mathematically equivalent to -i-1,
+	// such that 0 becomes -1, 1 becomes -2, and so forth.
+	// This ensures that remote offsets are always negative.
+	ns.offsets[len(ns.offsets)-1] = ^i
+}
+
+// replaceLastUnquotedName replaces the last name with the provided name.
+//
+// Invariant: Must call copyQuotedBuffer beforehand.
+func (ns *objectNameStack) replaceLastUnquotedName(s string) {
+	ns.ensureCopiedBuffer()
+	var startOffset int
+	if len(ns.offsets) > 1 {
+		startOffset = ns.offsets[len(ns.offsets)-2]
+	}
+	ns.unquotedNames = append(ns.unquotedNames[:startOffset], s...)
+	ns.offsets[len(ns.offsets)-1] = len(ns.unquotedNames)
+}
+
+// clearLast removes any name in the last JSON object.
+// It is semantically equivalent to ns.push followed by ns.pop.
+func (ns *objectNameStack) clearLast() {
+	ns.offsets[len(ns.offsets)-1] = invalidOffset
+}
+
+// pop ascends out of a nested JSON object.
+func (ns *objectNameStack) pop() {
+	ns.offsets = ns.offsets[:len(ns.offsets)-1]
+}
+
+// copyQuotedBuffer copies names from the remote buffer into the local names
+// buffer so that there are no more offset references into the remote buffer.
+// This allows the remote buffer to change contents without affecting
+// the names that this data structure is trying to remember.
+func (ns *objectNameStack) copyQuotedBuffer(b []byte) {
+	// Find the first negative offset.
+	var i int
+	for i = len(ns.offsets) - 1; i >= 0 && ns.offsets[i] < 0; i-- {
+		continue
+	}
+
+	// Copy each name from the remote buffer into the local buffer.
+	for i = i + 1; i < len(ns.offsets); i++ {
+		if i == len(ns.offsets)-1 && ns.offsets[i] == invalidOffset {
+			if i == 0 {
+				ns.offsets[i] = 0
+			} else {
+				ns.offsets[i] = ns.offsets[i-1]
+			}
+			break // last JSON object had a push without any names
+		}
+
+		// As a form of Hyrum proofing, we write an invalid character into the
+		// buffer to make misuse of Decoder.ReadToken more obvious.
+		// We need to undo that mutation here.
+		quotedName := b[^ns.offsets[i]:]
+		if quotedName[0] == invalidateBufferByte {
+			quotedName[0] = '"'
+		}
+
+		// Append the unquoted name to the local buffer.
+		var startOffset int
+		if i > 0 {
+			startOffset = ns.offsets[i-1]
+		}
+		if n := consumeSimpleString(quotedName); n > 0 {
+			ns.unquotedNames = append(ns.unquotedNames[:startOffset], quotedName[len(`"`):n-len(`"`)]...)
+		} else {
+			ns.unquotedNames, _ = unescapeString(ns.unquotedNames[:startOffset], quotedName)
+		}
+		ns.offsets[i] = len(ns.unquotedNames)
+	}
+}
+
+func (ns *objectNameStack) ensureCopiedBuffer() {
+	if len(ns.offsets) > 0 && ns.offsets[len(ns.offsets)-1] < 0 {
+		panic("BUG: copyQuotedBuffer not called beforehand")
+	}
+}
+
+// objectNamespaceStack is a stack of object namespaces.
+// This data structure assists in detecting duplicate names.
+type objectNamespaceStack []objectNamespace
+
+// reset resets the object namespace stack.
+func (nss *objectNamespaceStack) reset() {
+	if cap(*nss) > 1<<10 {
+		*nss = nil
+	}
+	*nss = (*nss)[:0]
+}
+
+// push starts a new namespace for a nested JSON object.
+func (nss *objectNamespaceStack) push() {
+	if cap(*nss) > len(*nss) {
+		*nss = (*nss)[:len(*nss)+1]
+		nss.last().reset()
+	} else {
+		*nss = append(*nss, objectNamespace{})
+	}
+}
+
+// last returns a pointer to the last JSON object namespace.
+func (nss objectNamespaceStack) last() *objectNamespace {
+	return &nss[len(nss)-1]
+}
+
+// pop terminates the namespace for a nested JSON object.
+func (nss *objectNamespaceStack) pop() {
+	*nss = (*nss)[:len(*nss)-1]
+}
+
+// objectNamespace is the namespace for a JSON object.
+// In contrast to objectNameStack, this needs to remember a all names
+// per JSON object.
+//
+// The zero value is an empty namespace ready for use.
+type objectNamespace struct {
+	// It relies on a linear search over all the names before switching
+	// to use a Go map for direct lookup.
+
+	// endOffsets is a list of offsets to the end of each name in buffers.
+	// The length of offsets is the number of names in the namespace.
+	endOffsets []uint
+	// allUnquotedNames is a back-to-back concatenation of every name in the namespace.
+	allUnquotedNames []byte
+	// mapNames is a Go map containing every name in the namespace.
+	// Only valid if non-nil.
+	mapNames map[string]struct{}
+}
+
+// reset resets the namespace to be empty.
+func (ns *objectNamespace) reset() {
+	ns.endOffsets = ns.endOffsets[:0]
+	ns.allUnquotedNames = ns.allUnquotedNames[:0]
+	ns.mapNames = nil
+	if cap(ns.endOffsets) > 1<<6 {
+		ns.endOffsets = nil // avoid pinning arbitrarily large amounts of memory
+	}
+	if cap(ns.allUnquotedNames) > 1<<10 {
+		ns.allUnquotedNames = nil // avoid pinning arbitrarily large amounts of memory
+	}
+}
+
+// length reports the number of names in the namespace.
+func (ns *objectNamespace) length() int {
+	return len(ns.endOffsets)
+}
+
+// getUnquoted retrieves the ith unquoted name in the namespace.
+func (ns *objectNamespace) getUnquoted(i int) []byte {
+	if i == 0 {
+		return ns.allUnquotedNames[:ns.endOffsets[0]]
+	} else {
+		return ns.allUnquotedNames[ns.endOffsets[i-1]:ns.endOffsets[i-0]]
+	}
+}
+
+// lastUnquoted retrieves the last name in the namespace.
+func (ns *objectNamespace) lastUnquoted() []byte {
+	return ns.getUnquoted(ns.length() - 1)
+}
+
+// insertQuoted inserts a name and reports whether it was inserted,
+// which only occurs if name is not already in the namespace.
+// The provided name must be a valid JSON string.
+func (ns *objectNamespace) insertQuoted(name []byte, isVerbatim bool) bool {
+	if isVerbatim {
+		name = name[len(`"`) : len(name)-len(`"`)]
+	}
+	return ns.insert(name, !isVerbatim)
+}
+func (ns *objectNamespace) insertUnquoted(name []byte) bool {
+	return ns.insert(name, false)
+}
+func (ns *objectNamespace) insert(name []byte, quoted bool) bool {
+	var allNames []byte
+	if quoted {
+		allNames, _ = unescapeString(ns.allUnquotedNames, name)
+	} else {
+		allNames = append(ns.allUnquotedNames, name...)
+	}
+	name = allNames[len(ns.allUnquotedNames):]
+
+	// Switch to a map if the buffer is too large for linear search.
+	// This does not add the current name to the map.
+	if ns.mapNames == nil && (ns.length() > 64 || len(ns.allUnquotedNames) > 1024) {
+		ns.mapNames = make(map[string]struct{})
+		var startOffset uint
+		for _, endOffset := range ns.endOffsets {
+			name := ns.allUnquotedNames[startOffset:endOffset]
+			ns.mapNames[string(name)] = struct{}{} // allocates a new string
+			startOffset = endOffset
+		}
+	}
+
+	if ns.mapNames == nil {
+		// Perform linear search over the buffer to find matching names.
+		// It provides O(n) lookup, but does not require any allocations.
+		var startOffset uint
+		for _, endOffset := range ns.endOffsets {
+			if string(ns.allUnquotedNames[startOffset:endOffset]) == string(name) {
+				return false
+			}
+			startOffset = endOffset
+		}
+	} else {
+		// Use the map if it is populated.
+		// It provides O(1) lookup, but requires a string allocation per name.
+		if _, ok := ns.mapNames[string(name)]; ok {
+			return false
+		}
+		ns.mapNames[string(name)] = struct{}{} // allocates a new string
+	}
+
+	ns.allUnquotedNames = allNames
+	ns.endOffsets = append(ns.endOffsets, uint(len(ns.allUnquotedNames)))
+	return true
+}
+
+// removeLast removes the last name in the namespace.
+func (ns *objectNamespace) removeLast() {
+	if ns.mapNames != nil {
+		delete(ns.mapNames, string(ns.lastUnquoted()))
+	}
+	if ns.length()-1 == 0 {
+		ns.endOffsets = ns.endOffsets[:0]
+		ns.allUnquotedNames = ns.allUnquotedNames[:0]
+	} else {
+		ns.endOffsets = ns.endOffsets[:ns.length()-1]
+		ns.allUnquotedNames = ns.allUnquotedNames[:ns.endOffsets[ns.length()-1]]
+	}
+}
+
+type uintSet64 uint64
+
+func (s uintSet64) has(i uint) bool { return s&(1<<i) > 0 }
+func (s *uintSet64) set(i uint)     { *s |= 1 << i }
+
+// uintSet is a set of unsigned integers.
+// It is optimized for most integers being close to zero.
+type uintSet struct {
+	lo uintSet64
+	hi []uintSet64
+}
+
+// has reports whether i is in the set.
+func (s *uintSet) has(i uint) bool {
+	if i < 64 {
+		return s.lo.has(i)
+	} else {
+		i -= 64
+		iHi, iLo := int(i/64), uint(i%64)
+		return iHi < len(s.hi) && s.hi[iHi].has(iLo)
+	}
+}
+
+// insert inserts i into the set and reports whether it was the first insertion.
+func (s *uintSet) insert(i uint) bool {
+	// TODO: Make this inlineable at least for the lower 64-bit case.
+	if i < 64 {
+		has := s.lo.has(i)
+		s.lo.set(i)
+		return !has
+	} else {
+		i -= 64
+		iHi, iLo := int(i/64), uint(i%64)
+		if iHi >= len(s.hi) {
+			s.hi = append(s.hi, make([]uintSet64, iHi+1-len(s.hi))...)
+			s.hi = s.hi[:cap(s.hi)]
+		}
+		has := s.hi[iHi].has(iLo)
+		s.hi[iHi].set(iLo)
+		return !has
+	}
+}

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/token.go

@@ -0,0 +1,522 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"math"
+	"strconv"
+)
+
+// NOTE: Token is analogous to v1 json.Token.
+
+const (
+	maxInt64  = math.MaxInt64
+	minInt64  = math.MinInt64
+	maxUint64 = math.MaxUint64
+	minUint64 = 0 // for consistency and readability purposes
+
+	invalidTokenPanic = "invalid json.Token; it has been voided by a subsequent json.Decoder call"
+)
+
+// Token represents a lexical JSON token, which may be one of the following:
+//   - a JSON literal (i.e., null, true, or false)
+//   - a JSON string (e.g., "hello, world!")
+//   - a JSON number (e.g., 123.456)
+//   - a start or end delimiter for a JSON object (i.e., { or } )
+//   - a start or end delimiter for a JSON array (i.e., [ or ] )
+//
+// A Token cannot represent entire array or object values, while a RawValue can.
+// There is no Token to represent commas and colons since
+// these structural tokens can be inferred from the surrounding context.
+type Token struct {
+	nonComparable
+
+	// Tokens can exist in either a "raw" or an "exact" form.
+	// Tokens produced by the Decoder are in the "raw" form.
+	// Tokens returned by constructors are usually in the "exact" form.
+	// The Encoder accepts Tokens in either the "raw" or "exact" form.
+	//
+	// The following chart shows the possible values for each Token type:
+	//	╔═════════════════╦════════════╤════════════╤════════════╗
+	//	║ Token type      ║ raw field  │ str field  │ num field  ║
+	//	╠═════════════════╬════════════╪════════════╪════════════╣
+	//	║ null   (raw)    ║ "null"     │ ""         │ 0          ║
+	//	║ false  (raw)    ║ "false"    │ ""         │ 0          ║
+	//	║ true   (raw)    ║ "true"     │ ""         │ 0          ║
+	//	║ string (raw)    ║ non-empty  │ ""         │ offset     ║
+	//	║ string (string) ║ nil        │ non-empty  │ 0          ║
+	//	║ number (raw)    ║ non-empty  │ ""         │ offset     ║
+	//	║ number (float)  ║ nil        │ "f"        │ non-zero   ║
+	//	║ number (int64)  ║ nil        │ "i"        │ non-zero   ║
+	//	║ number (uint64) ║ nil        │ "u"        │ non-zero   ║
+	//	║ object (delim)  ║ "{" or "}" │ ""         │ 0          ║
+	//	║ array  (delim)  ║ "[" or "]" │ ""         │ 0          ║
+	//	╚═════════════════╩════════════╧════════════╧════════════╝
+	//
+	// Notes:
+	//   - For tokens stored in "raw" form, the num field contains the
+	//     absolute offset determined by raw.previousOffsetStart().
+	//     The buffer itself is stored in raw.previousBuffer().
+	//   - JSON literals and structural characters are always in the "raw" form.
+	//   - JSON strings and numbers can be in either "raw" or "exact" forms.
+	//   - The exact zero value of JSON strings and numbers in the "exact" forms
+	//     have ambiguous representation. Thus, they are always represented
+	//     in the "raw" form.
+
+	// raw contains a reference to the raw decode buffer.
+	// If non-nil, then its value takes precedence over str and num.
+	// It is only valid if num == raw.previousOffsetStart().
+	raw *decodeBuffer
+
+	// str is the unescaped JSON string if num is zero.
+	// Otherwise, it is "f", "i", or "u" if num should be interpreted
+	// as a float64, int64, or uint64, respectively.
+	str string
+
+	// num is a float64, int64, or uint64 stored as a uint64 value.
+	// It is non-zero for any JSON number in the "exact" form.
+	num uint64
+}
+
+// TODO: Does representing 1-byte delimiters as *decodeBuffer cause performance issues?
+
+var (
+	Null  Token = rawToken("null")
+	False Token = rawToken("false")
+	True  Token = rawToken("true")
+
+	ObjectStart Token = rawToken("{")
+	ObjectEnd   Token = rawToken("}")
+	ArrayStart  Token = rawToken("[")
+	ArrayEnd    Token = rawToken("]")
+
+	zeroString Token = rawToken(`""`)
+	zeroNumber Token = rawToken(`0`)
+
+	nanString  Token = String("NaN")
+	pinfString Token = String("Infinity")
+	ninfString Token = String("-Infinity")
+)
+
+func rawToken(s string) Token {
+	return Token{raw: &decodeBuffer{buf: []byte(s), prevStart: 0, prevEnd: len(s)}}
+}
+
+// Bool constructs a Token representing a JSON boolean.
+func Bool(b bool) Token {
+	if b {
+		return True
+	}
+	return False
+}
+
+// String construct a Token representing a JSON string.
+// The provided string should contain valid UTF-8, otherwise invalid characters
+// may be mangled as the Unicode replacement character.
+func String(s string) Token {
+	if len(s) == 0 {
+		return zeroString
+	}
+	return Token{str: s}
+}
+
+// Float constructs a Token representing a JSON number.
+// The values NaN, +Inf, and -Inf will be represented
+// as a JSON string with the values "NaN", "Infinity", and "-Infinity".
+func Float(n float64) Token {
+	switch {
+	case math.Float64bits(n) == 0:
+		return zeroNumber
+	case math.IsNaN(n):
+		return nanString
+	case math.IsInf(n, +1):
+		return pinfString
+	case math.IsInf(n, -1):
+		return ninfString
+	}
+	return Token{str: "f", num: math.Float64bits(n)}
+}
+
+// Int constructs a Token representing a JSON number from an int64.
+func Int(n int64) Token {
+	if n == 0 {
+		return zeroNumber
+	}
+	return Token{str: "i", num: uint64(n)}
+}
+
+// Uint constructs a Token representing a JSON number from a uint64.
+func Uint(n uint64) Token {
+	if n == 0 {
+		return zeroNumber
+	}
+	return Token{str: "u", num: uint64(n)}
+}
+
+// Clone makes a copy of the Token such that its value remains valid
+// even after a subsequent Decoder.Read call.
+func (t Token) Clone() Token {
+	// TODO: Allow caller to avoid any allocations?
+	if raw := t.raw; raw != nil {
+		// Avoid copying globals.
+		if t.raw.prevStart == 0 {
+			switch t.raw {
+			case Null.raw:
+				return Null
+			case False.raw:
+				return False
+			case True.raw:
+				return True
+			case ObjectStart.raw:
+				return ObjectStart
+			case ObjectEnd.raw:
+				return ObjectEnd
+			case ArrayStart.raw:
+				return ArrayStart
+			case ArrayEnd.raw:
+				return ArrayEnd
+			}
+		}
+
+		if uint64(raw.previousOffsetStart()) != t.num {
+			panic(invalidTokenPanic)
+		}
+		// TODO(https://go.dev/issue/45038): Use bytes.Clone.
+		buf := append([]byte(nil), raw.previousBuffer()...)
+		return Token{raw: &decodeBuffer{buf: buf, prevStart: 0, prevEnd: len(buf)}}
+	}
+	return t
+}
+
+// Bool returns the value for a JSON boolean.
+// It panics if the token kind is not a JSON boolean.
+func (t Token) Bool() bool {
+	switch t.raw {
+	case True.raw:
+		return true
+	case False.raw:
+		return false
+	default:
+		panic("invalid JSON token kind: " + t.Kind().String())
+	}
+}
+
+// appendString appends a JSON string to dst and returns it.
+// It panics if t is not a JSON string.
+func (t Token) appendString(dst []byte, validateUTF8, preserveRaw bool, escapeRune func(rune) bool) ([]byte, error) {
+	if raw := t.raw; raw != nil {
+		// Handle raw string value.
+		buf := raw.previousBuffer()
+		if Kind(buf[0]) == '"' {
+			if escapeRune == nil && consumeSimpleString(buf) == len(buf) {
+				return append(dst, buf...), nil
+			}
+			dst, _, err := reformatString(dst, buf, validateUTF8, preserveRaw, escapeRune)
+			return dst, err
+		}
+	} else if len(t.str) != 0 && t.num == 0 {
+		// Handle exact string value.
+		return appendString(dst, t.str, validateUTF8, escapeRune)
+	}
+
+	panic("invalid JSON token kind: " + t.Kind().String())
+}
+
+// String returns the unescaped string value for a JSON string.
+// For other JSON kinds, this returns the raw JSON represention.
+func (t Token) String() string {
+	// This is inlinable to take advantage of "function outlining".
+	// This avoids an allocation for the string(b) conversion
+	// if the caller does not use the string in an escaping manner.
+	// See https://blog.filippo.io/efficient-go-apis-with-the-inliner/
+	s, b := t.string()
+	if len(b) > 0 {
+		return string(b)
+	}
+	return s
+}
+func (t Token) string() (string, []byte) {
+	if raw := t.raw; raw != nil {
+		if uint64(raw.previousOffsetStart()) != t.num {
+			panic(invalidTokenPanic)
+		}
+		buf := raw.previousBuffer()
+		if buf[0] == '"' {
+			// TODO: Preserve valueFlags in Token?
+			isVerbatim := consumeSimpleString(buf) == len(buf)
+			return "", unescapeStringMayCopy(buf, isVerbatim)
+		}
+		// Handle tokens that are not JSON strings for fmt.Stringer.
+		return "", buf
+	}
+	if len(t.str) != 0 && t.num == 0 {
+		return t.str, nil
+	}
+	// Handle tokens that are not JSON strings for fmt.Stringer.
+	if t.num > 0 {
+		switch t.str[0] {
+		case 'f':
+			return string(appendNumber(nil, math.Float64frombits(t.num), 64)), nil
+		case 'i':
+			return strconv.FormatInt(int64(t.num), 10), nil
+		case 'u':
+			return strconv.FormatUint(uint64(t.num), 10), nil
+		}
+	}
+	return "<invalid json.Token>", nil
+}
+
+// appendNumber appends a JSON number to dst and returns it.
+// It panics if t is not a JSON number.
+func (t Token) appendNumber(dst []byte, canonicalize bool) ([]byte, error) {
+	if raw := t.raw; raw != nil {
+		// Handle raw number value.
+		buf := raw.previousBuffer()
+		if Kind(buf[0]).normalize() == '0' {
+			if !canonicalize {
+				return append(dst, buf...), nil
+			}
+			dst, _, err := reformatNumber(dst, buf, canonicalize)
+			return dst, err
+		}
+	} else if t.num != 0 {
+		// Handle exact number value.
+		switch t.str[0] {
+		case 'f':
+			return appendNumber(dst, math.Float64frombits(t.num), 64), nil
+		case 'i':
+			return strconv.AppendInt(dst, int64(t.num), 10), nil
+		case 'u':
+			return strconv.AppendUint(dst, uint64(t.num), 10), nil
+		}
+	}
+
+	panic("invalid JSON token kind: " + t.Kind().String())
+}
+
+// Float returns the floating-point value for a JSON number.
+// It returns a NaN, +Inf, or -Inf value for any JSON string
+// with the values "NaN", "Infinity", or "-Infinity".
+// It panics for all other cases.
+func (t Token) Float() float64 {
+	if raw := t.raw; raw != nil {
+		// Handle raw number value.
+		if uint64(raw.previousOffsetStart()) != t.num {
+			panic(invalidTokenPanic)
+		}
+		buf := raw.previousBuffer()
+		if Kind(buf[0]).normalize() == '0' {
+			fv, _ := parseFloat(buf, 64)
+			return fv
+		}
+	} else if t.num != 0 {
+		// Handle exact number value.
+		switch t.str[0] {
+		case 'f':
+			return math.Float64frombits(t.num)
+		case 'i':
+			return float64(int64(t.num))
+		case 'u':
+			return float64(uint64(t.num))
+		}
+	}
+
+	// Handle string values with "NaN", "Infinity", or "-Infinity".
+	if t.Kind() == '"' {
+		switch t.String() {
+		case "NaN":
+			return math.NaN()
+		case "Infinity":
+			return math.Inf(+1)
+		case "-Infinity":
+			return math.Inf(-1)
+		}
+	}
+
+	panic("invalid JSON token kind: " + t.Kind().String())
+}
+
+// Int returns the signed integer value for a JSON number.
+// The fractional component of any number is ignored (truncation toward zero).
+// Any number beyond the representation of an int64 will be saturated
+// to the closest representable value.
+// It panics if the token kind is not a JSON number.
+func (t Token) Int() int64 {
+	if raw := t.raw; raw != nil {
+		// Handle raw integer value.
+		if uint64(raw.previousOffsetStart()) != t.num {
+			panic(invalidTokenPanic)
+		}
+		neg := false
+		buf := raw.previousBuffer()
+		if len(buf) > 0 && buf[0] == '-' {
+			neg, buf = true, buf[1:]
+		}
+		if numAbs, ok := parseDecUint(buf); ok {
+			if neg {
+				if numAbs > -minInt64 {
+					return minInt64
+				}
+				return -1 * int64(numAbs)
+			} else {
+				if numAbs > +maxInt64 {
+					return maxInt64
+				}
+				return +1 * int64(numAbs)
+			}
+		}
+	} else if t.num != 0 {
+		// Handle exact integer value.
+		switch t.str[0] {
+		case 'i':
+			return int64(t.num)
+		case 'u':
+			if uint64(t.num) > maxInt64 {
+				return maxInt64
+			}
+			return int64(uint64(t.num))
+		}
+	}
+
+	// Handle JSON number that is a floating-point value.
+	if t.Kind() == '0' {
+		switch fv := t.Float(); {
+		case fv >= maxInt64:
+			return maxInt64
+		case fv <= minInt64:
+			return minInt64
+		default:
+			return int64(fv) // truncation toward zero
+		}
+	}
+
+	panic("invalid JSON token kind: " + t.Kind().String())
+}
+
+// Uint returns the unsigned integer value for a JSON number.
+// The fractional component of any number is ignored (truncation toward zero).
+// Any number beyond the representation of an uint64 will be saturated
+// to the closest representable value.
+// It panics if the token kind is not a JSON number.
+func (t Token) Uint() uint64 {
+	// NOTE: This accessor returns 0 for any negative JSON number,
+	// which might be surprising, but is at least consistent with the behavior
+	// of saturating out-of-bounds numbers to the closest representable number.
+
+	if raw := t.raw; raw != nil {
+		// Handle raw integer value.
+		if uint64(raw.previousOffsetStart()) != t.num {
+			panic(invalidTokenPanic)
+		}
+		neg := false
+		buf := raw.previousBuffer()
+		if len(buf) > 0 && buf[0] == '-' {
+			neg, buf = true, buf[1:]
+		}
+		if num, ok := parseDecUint(buf); ok {
+			if neg {
+				return minUint64
+			}
+			return num
+		}
+	} else if t.num != 0 {
+		// Handle exact integer value.
+		switch t.str[0] {
+		case 'u':
+			return uint64(t.num)
+		case 'i':
+			if int64(t.num) < minUint64 {
+				return minUint64
+			}
+			return uint64(int64(t.num))
+		}
+	}
+
+	// Handle JSON number that is a floating-point value.
+	if t.Kind() == '0' {
+		switch fv := t.Float(); {
+		case fv >= maxUint64:
+			return maxUint64
+		case fv <= minUint64:
+			return minUint64
+		default:
+			return uint64(fv) // truncation toward zero
+		}
+	}
+
+	panic("invalid JSON token kind: " + t.Kind().String())
+}
+
+// Kind returns the token kind.
+func (t Token) Kind() Kind {
+	switch {
+	case t.raw != nil:
+		raw := t.raw
+		if uint64(raw.previousOffsetStart()) != t.num {
+			panic(invalidTokenPanic)
+		}
+		return Kind(t.raw.buf[raw.prevStart]).normalize()
+	case t.num != 0:
+		return '0'
+	case len(t.str) != 0:
+		return '"'
+	default:
+		return invalidKind
+	}
+}
+
+// Kind represents each possible JSON token kind with a single byte,
+// which is conveniently the first byte of that kind's grammar
+// with the restriction that numbers always be represented with '0':
+//
+//   - 'n': null
+//   - 'f': false
+//   - 't': true
+//   - '"': string
+//   - '0': number
+//   - '{': object start
+//   - '}': object end
+//   - '[': array start
+//   - ']': array end
+//
+// An invalid kind is usually represented using 0,
+// but may be non-zero due to invalid JSON data.
+type Kind byte
+
+const invalidKind Kind = 0
+
+// String prints the kind in a humanly readable fashion.
+func (k Kind) String() string {
+	switch k {
+	case 'n':
+		return "null"
+	case 'f':
+		return "false"
+	case 't':
+		return "true"
+	case '"':
+		return "string"
+	case '0':
+		return "number"
+	case '{':
+		return "{"
+	case '}':
+		return "}"
+	case '[':
+		return "["
+	case ']':
+		return "]"
+	default:
+		return "<invalid json.Kind: " + quoteRune([]byte{byte(k)}) + ">"
+	}
+}
+
+// normalize coalesces all possible starting characters of a number as just '0'.
+func (k Kind) normalize() Kind {
+	if k == '-' || ('0' <= k && k <= '9') {
+		return '0'
+	}
+	return k
+}

vendor/k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json/value.go

@@ -0,0 +1,375 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"bytes"
+	"errors"
+	"io"
+	"sort"
+	"sync"
+	"unicode/utf16"
+	"unicode/utf8"
+)
+
+// NOTE: RawValue is analogous to v1 json.RawMessage.
+
+// RawValue represents a single raw JSON value, which may be one of the following:
+//   - a JSON literal (i.e., null, true, or false)
+//   - a JSON string (e.g., "hello, world!")
+//   - a JSON number (e.g., 123.456)
+//   - an entire JSON object (e.g., {"fizz":"buzz"} )
+//   - an entire JSON array (e.g., [1,2,3] )
+//
+// RawValue can represent entire array or object values, while Token cannot.
+// RawValue may contain leading and/or trailing whitespace.
+type RawValue []byte
+
+// Clone returns a copy of v.
+func (v RawValue) Clone() RawValue {
+	if v == nil {
+		return nil
+	}
+	return append(RawValue{}, v...)
+}
+
+// String returns the string formatting of v.
+func (v RawValue) String() string {
+	if v == nil {
+		return "null"
+	}
+	return string(v)
+}
+
+// IsValid reports whether the raw JSON value is syntactically valid
+// according to RFC 7493.
+//
+// It verifies whether the input is properly encoded as UTF-8,
+// that escape sequences within strings decode to valid Unicode codepoints, and
+// that all names in each object are unique.
+// It does not verify whether numbers are representable within the limits
+// of any common numeric type (e.g., float64, int64, or uint64).
+func (v RawValue) IsValid() bool {
+	d := getBufferedDecoder(v, DecodeOptions{})
+	defer putBufferedDecoder(d)
+	_, errVal := d.ReadValue()
+	_, errEOF := d.ReadToken()
+	return errVal == nil && errEOF == io.EOF
+}
+
+// Compact removes all whitespace from the raw JSON value.
+//
+// It does not reformat JSON strings to use any other representation.
+// It is guaranteed to succeed if the input is valid.
+// If the value is already compacted, then the buffer is not mutated.
+func (v *RawValue) Compact() error {
+	return v.reformat(false, false, "", "")
+}
+
+// Indent reformats the whitespace in the raw JSON value so that each element
+// in a JSON object or array begins on a new, indented line beginning with
+// prefix followed by one or more copies of indent according to the nesting.
+// The value does not begin with the prefix nor any indention,
+// to make it easier to embed inside other formatted JSON data.
+//
+// It does not reformat JSON strings to use any other representation.
+// It is guaranteed to succeed if the input is valid.
+// If the value is already indented properly, then the buffer is not mutated.
+func (v *RawValue) Indent(prefix, indent string) error {
+	return v.reformat(false, true, prefix, indent)
+}
+
+// Canonicalize canonicalizes the raw JSON value according to the
+// JSON Canonicalization Scheme (JCS) as defined by RFC 8785
+// where it produces a stable representation of a JSON value.
+//
+// The output stability is dependent on the stability of the application data
+// (see RFC 8785, Appendix E). It cannot produce stable output from
+// fundamentally unstable input. For example, if the JSON value
+// contains ephemeral data (e.g., a frequently changing timestamp),
+// then the value is still unstable regardless of whether this is called.
+//
+// Note that JCS treats all JSON numbers as IEEE 754 double precision numbers.
+// Any numbers with precision beyond what is representable by that form
+// will lose their precision when canonicalized. For example, integer values
+// beyond ±2⁵³ will lose their precision. It is recommended that
+// int64 and uint64 data types be represented as a JSON string.
+//
+// It is guaranteed to succeed if the input is valid.
+// If the value is already canonicalized, then the buffer is not mutated.
+func (v *RawValue) Canonicalize() error {
+	return v.reformat(true, false, "", "")
+}
+
+// TODO: Instead of implementing the v1 Marshaler/Unmarshaler,
+// consider implementing the v2 versions instead.
+
+// MarshalJSON returns v as the JSON encoding of v.
+// It returns the stored value as the raw JSON output without any validation.
+// If v is nil, then this returns a JSON null.
+func (v RawValue) MarshalJSON() ([]byte, error) {
+	// NOTE: This matches the behavior of v1 json.RawMessage.MarshalJSON.
+	if v == nil {
+		return []byte("null"), nil
+	}
+	return v, nil
+}
+
+// UnmarshalJSON sets v as the JSON encoding of b.
+// It stores a copy of the provided raw JSON input without any validation.
+func (v *RawValue) UnmarshalJSON(b []byte) error {
+	// NOTE: This matches the behavior of v1 json.RawMessage.UnmarshalJSON.
+	if v == nil {
+		return errors.New("json.RawValue: UnmarshalJSON on nil pointer")
+	}
+	*v = append((*v)[:0], b...)
+	return nil
+}
+
+// Kind returns the starting token kind.
+// For a valid value, this will never include '}' or ']'.
+func (v RawValue) Kind() Kind {
+	if v := v[consumeWhitespace(v):]; len(v) > 0 {
+		return Kind(v[0]).normalize()
+	}
+	return invalidKind
+}
+
+func (v *RawValue) reformat(canonical, multiline bool, prefix, indent string) error {
+	var eo EncodeOptions
+	if canonical {
+		eo.AllowInvalidUTF8 = false    // per RFC 8785, section 3.2.4
+		eo.AllowDuplicateNames = false // per RFC 8785, section 3.1
+		eo.canonicalizeNumbers = true  // per RFC 8785, section 3.2.2.3
+		eo.EscapeRune = nil            // per RFC 8785, section 3.2.2.2
+		eo.multiline = false           // per RFC 8785, section 3.2.1
+	} else {
+		if s := trimLeftSpaceTab(prefix); len(s) > 0 {
+			panic("json: invalid character " + quoteRune([]byte(s)) + " in indent prefix")
+		}
+		if s := trimLeftSpaceTab(indent); len(s) > 0 {
+			panic("json: invalid character " + quoteRune([]byte(s)) + " in indent")
+		}
+		eo.AllowInvalidUTF8 = true
+		eo.AllowDuplicateNames = true
+		eo.preserveRawStrings = true
+		eo.multiline = multiline // in case indent is empty
+		eo.IndentPrefix = prefix
+		eo.Indent = indent
+	}
+	eo.omitTopLevelNewline = true
+
+	// Write the entire value to reformat all tokens and whitespace.
+	e := getBufferedEncoder(eo)
+	defer putBufferedEncoder(e)
+	if err := e.WriteValue(*v); err != nil {
+		return err
+	}
+
+	// For canonical output, we may need to reorder object members.
+	if canonical {
+		// Obtain a buffered encoder just to use its internal buffer as
+		// a scratch buffer in reorderObjects for reordering object members.
+		e2 := getBufferedEncoder(EncodeOptions{})
+		defer putBufferedEncoder(e2)
+
+		// Disable redundant checks performed earlier during encoding.
+		d := getBufferedDecoder(e.buf, DecodeOptions{AllowInvalidUTF8: true, AllowDuplicateNames: true})
+		defer putBufferedDecoder(d)
+		reorderObjects(d, &e2.buf) // per RFC 8785, section 3.2.3
+	}
+
+	// Store the result back into the value if different.
+	if !bytes.Equal(*v, e.buf) {
+		*v = append((*v)[:0], e.buf...)
+	}
+	return nil
+}
+
+func trimLeftSpaceTab(s string) string {
+	for i, r := range s {
+		switch r {
+		case ' ', '\t':
+		default:
+			return s[i:]
+		}
+	}
+	return ""
+}
+
+type memberName struct {
+	// name is the unescaped name.
+	name []byte
+	// before and after are byte offsets into Decoder.buf that represents
+	// the entire name/value pair. It may contain leading commas.
+	before, after int64
+}
+
+var memberNamePool = sync.Pool{New: func() any { return new(memberNames) }}
+
+func getMemberNames() *memberNames {
+	ns := memberNamePool.Get().(*memberNames)
+	*ns = (*ns)[:0]
+	return ns
+}
+func putMemberNames(ns *memberNames) {
+	if cap(*ns) < 1<<10 {
+		for i := range *ns {
+			(*ns)[i] = memberName{} // avoid pinning name
+		}
+		memberNamePool.Put(ns)
+	}
+}
+
+type memberNames []memberName
+
+func (m *memberNames) Len() int           { return len(*m) }
+func (m *memberNames) Less(i, j int) bool { return lessUTF16((*m)[i].name, (*m)[j].name) }
+func (m *memberNames) Swap(i, j int)      { (*m)[i], (*m)[j] = (*m)[j], (*m)[i] }
+
+// reorderObjects recursively reorders all object members in place
+// according to the ordering specified in RFC 8785, section 3.2.3.
+//
+// Pre-conditions:
+//   - The value is valid (i.e., no decoder errors should ever occur).
+//   - The value is compact (i.e., no whitespace is present).
+//   - Initial call is provided a Decoder reading from the start of v.
+//
+// Post-conditions:
+//   - Exactly one JSON value is read from the Decoder.
+//   - All fully-parsed JSON objects are reordered by directly moving
+//     the members in the value buffer.
+//
+// The runtime is approximately O(n·log(n)) + O(m·log(m)),
+// where n is len(v) and m is the total number of object members.
+func reorderObjects(d *Decoder, scratch *[]byte) {
+	switch tok, _ := d.ReadToken(); tok.Kind() {
+	case '{':
+		// Iterate and collect the name and offsets for every object member.
+		members := getMemberNames()
+		defer putMemberNames(members)
+		var prevName []byte
+		isSorted := true
+
+		beforeBody := d.InputOffset() // offset after '{'
+		for d.PeekKind() != '}' {
+			beforeName := d.InputOffset()
+			var flags valueFlags
+			name, _ := d.readValue(&flags)
+			name = unescapeStringMayCopy(name, flags.isVerbatim())
+			reorderObjects(d, scratch)
+			afterValue := d.InputOffset()
+
+			if isSorted && len(*members) > 0 {
+				isSorted = lessUTF16(prevName, name)
+			}
+			*members = append(*members, memberName{name, beforeName, afterValue})
+			prevName = name
+		}
+		afterBody := d.InputOffset() // offset before '}'
+		d.ReadToken()
+
+		// Sort the members; return early if it's already sorted.
+		if isSorted {
+			return
+		}
+		// TODO(https://go.dev/issue/47619): Use slices.Sort.
+		sort.Sort(members)
+
+		// Append the reordered members to a new buffer,
+		// then copy the reordered members back over the original members.
+		// Avoid swapping in place since each member may be a different size
+		// where moving a member over a smaller member may corrupt the data
+		// for subsequent members before they have been moved.
+		//
+		// The following invariant must hold:
+		//	sum([m.after-m.before for m in members]) == afterBody-beforeBody
+		sorted := (*scratch)[:0]
+		for i, member := range *members {
+			if d.buf[member.before] == ',' {
+				member.before++ // trim leading comma
+			}
+			sorted = append(sorted, d.buf[member.before:member.after]...)
+			if i < len(*members)-1 {
+				sorted = append(sorted, ',') // append trailing comma
+			}
+		}
+		if int(afterBody-beforeBody) != len(sorted) {
+			panic("BUG: length invariant violated")
+		}
+		copy(d.buf[beforeBody:afterBody], sorted)
+
+		// Update scratch buffer to the largest amount ever used.
+		if len(sorted) > len(*scratch) {
+			*scratch = sorted
+		}
+	case '[':
+		for d.PeekKind() != ']' {
+			reorderObjects(d, scratch)
+		}
+		d.ReadToken()
+	}
+}
+
+// lessUTF16 reports whether x is lexicographically less than y according
+// to the UTF-16 codepoints of the UTF-8 encoded input strings.
+// This implements the ordering specified in RFC 8785, section 3.2.3.
+// The inputs must be valid UTF-8, otherwise this may panic.
+func lessUTF16(x, y []byte) bool {
+	// NOTE: This is an optimized, allocation-free implementation
+	// of lessUTF16Simple in fuzz_test.go. FuzzLessUTF16 verifies that the
+	// two implementations agree on the result of comparing any two strings.
+
+	isUTF16Self := func(r rune) bool {
+		return ('\u0000' <= r && r <= '\uD7FF') || ('\uE000' <= r && r <= '\uFFFF')
+	}
+
+	for {
+		if len(x) == 0 || len(y) == 0 {
+			return len(x) < len(y)
+		}
+
+		// ASCII fast-path.
+		if x[0] < utf8.RuneSelf || y[0] < utf8.RuneSelf {
+			if x[0] != y[0] {
+				return x[0] < y[0]
+			}
+			x, y = x[1:], y[1:]
+			continue
+		}
+
+		// Decode next pair of runes as UTF-8.
+		rx, nx := utf8.DecodeRune(x)
+		ry, ny := utf8.DecodeRune(y)
+		switch {
+
+		// Both runes encode as either a single or surrogate pair
+		// of UTF-16 codepoints.
+		case isUTF16Self(rx) == isUTF16Self(ry):
+			if rx != ry {
+				return rx < ry
+			}
+
+		// The x rune is a single UTF-16 codepoint, while
+		// the y rune is a surrogate pair of UTF-16 codepoints.
+		case isUTF16Self(rx):
+			ry, _ := utf16.EncodeRune(ry)
+			if rx != ry {
+				return rx < ry
+			}
+			panic("BUG: invalid UTF-8") // implies rx is an unpaired surrogate half
+
+		// The y rune is a single UTF-16 codepoint, while
+		// the x rune is a surrogate pair of UTF-16 codepoints.
+		case isUTF16Self(ry):
+			rx, _ := utf16.EncodeRune(rx)
+			if rx != ry {
+				return rx < ry
+			}
+			panic("BUG: invalid UTF-8") // implies ry is an unpaired surrogate half
+		}
+		x, y = x[nx:], y[ny:]
+	}
+}

vendor/k8s.io/kube-openapi/pkg/validation/spec/fuzz.go

@@ -0,0 +1,502 @@
+/*
+Copyright 2022 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package spec
+
+import (
+	"github.com/go-openapi/jsonreference"
+	"github.com/google/go-cmp/cmp"
+	fuzz "github.com/google/gofuzz"
+)
+
+var SwaggerFuzzFuncs []interface{} = []interface{}{
+	func(v *Responses, c fuzz.Continue) {
+		c.FuzzNoCustom(v)
+		if v.Default != nil {
+			// Check if we hit maxDepth and left an incomplete value
+			if v.Default.Description == "" {
+				v.Default = nil
+				v.StatusCodeResponses = nil
+			}
+		}
+
+		// conversion has no way to discern empty statusCodeResponses from
+		// nil, since "default" is always included in the map.
+		// So avoid empty responses list
+		if len(v.StatusCodeResponses) == 0 {
+			v.StatusCodeResponses = nil
+		}
+	},
+	func(v *Operation, c fuzz.Continue) {
+		c.FuzzNoCustom(v)
+
+		if v != nil {
+			// force non-nil
+			v.Responses = &Responses{}
+			c.Fuzz(v.Responses)
+
+			v.Schemes = nil
+			if c.RandBool() {
+				v.Schemes = append(v.Schemes, "http")
+			}
+
+			if c.RandBool() {
+				v.Schemes = append(v.Schemes, "https")
+			}
+
+			if c.RandBool() {
+				v.Schemes = append(v.Schemes, "ws")
+			}
+
+			if c.RandBool() {
+				v.Schemes = append(v.Schemes, "wss")
+			}
+
+			// Gnostic unconditionally makes security values non-null
+			// So do not fuzz null values into the array.
+			for i, val := range v.Security {
+				if val == nil {
+					v.Security[i] = make(map[string][]string)
+				}
+
+				for k, v := range val {
+					if v == nil {
+						val[k] = make([]string, 0)
+					}
+				}
+			}
+		}
+	},
+	func(v map[int]Response, c fuzz.Continue) {
+		n := 0
+		c.Fuzz(&n)
+		if n == 0 {
+			// Test that fuzzer is not at maxDepth so we do not
+			// end up with empty elements
+			return
+		}
+
+		// Prevent negative numbers
+		num := c.Intn(4)
+		for i := 0; i < num+2; i++ {
+			val := Response{}
+			c.Fuzz(&val)
+
+			val.Description = c.RandString() + "x"
+			v[100*(i+1)+c.Intn(100)] = val
+		}
+	},
+	func(v map[string]PathItem, c fuzz.Continue) {
+		n := 0
+		c.Fuzz(&n)
+		if n == 0 {
+			// Test that fuzzer is not at maxDepth so we do not
+			// end up with empty elements
+			return
+		}
+
+		num := c.Intn(5)
+		for i := 0; i < num+2; i++ {
+			val := PathItem{}
+			c.Fuzz(&val)
+
+			// Ref params are only allowed in certain locations, so
+			// possibly add a few to PathItems
+			numRefsToAdd := c.Intn(5)
+			for i := 0; i < numRefsToAdd; i++ {
+				theRef := Parameter{}
+				c.Fuzz(&theRef.Refable)
+
+				val.Parameters = append(val.Parameters, theRef)
+			}
+
+			v["/"+c.RandString()] = val
+		}
+	},
+	func(v *SchemaOrArray, c fuzz.Continue) {
+		*v = SchemaOrArray{}
+		// gnostic parser just doesn't support more
+		// than one Schema here
+		v.Schema = &Schema{}
+		c.Fuzz(&v.Schema)
+
+	},
+	func(v *SchemaOrBool, c fuzz.Continue) {
+		*v = SchemaOrBool{}
+
+		if c.RandBool() {
+			v.Allows = c.RandBool()
+		} else {
+			v.Schema = &Schema{}
+			v.Allows = true
+			c.Fuzz(&v.Schema)
+		}
+	},
+	func(v map[string]Response, c fuzz.Continue) {
+		n := 0
+		c.Fuzz(&n)
+		if n == 0 {
+			// Test that fuzzer is not at maxDepth so we do not
+			// end up with empty elements
+			return
+		}
+
+		// Response definitions are not allowed to
+		// be refs
+		for i := 0; i < c.Intn(5)+1; i++ {
+			resp := &Response{}
+
+			c.Fuzz(resp)
+			resp.Ref = Ref{}
+			resp.Description = c.RandString() + "x"
+
+			// Response refs are not vendor extensible by gnostic
+			resp.VendorExtensible.Extensions = nil
+			v[c.RandString()+"x"] = *resp
+		}
+	},
+	func(v *Header, c fuzz.Continue) {
+		if v != nil {
+			c.FuzzNoCustom(v)
+
+			// descendant Items of Header may not be refs
+			cur := v.Items
+			for cur != nil {
+				cur.Ref = Ref{}
+				cur = cur.Items
+			}
+		}
+	},
+	func(v *Ref, c fuzz.Continue) {
+		*v = Ref{}
+		v.Ref, _ = jsonreference.New("http://asd.com/" + c.RandString())
+	},
+	func(v *Response, c fuzz.Continue) {
+		*v = Response{}
+		if c.RandBool() {
+			v.Ref = Ref{}
+			v.Ref.Ref, _ = jsonreference.New("http://asd.com/" + c.RandString())
+		} else {
+			c.Fuzz(&v.VendorExtensible)
+			c.Fuzz(&v.Schema)
+			c.Fuzz(&v.ResponseProps)
+
+			v.Headers = nil
+			v.Ref = Ref{}
+
+			n := 0
+			c.Fuzz(&n)
+			if n != 0 {
+				// Test that fuzzer is not at maxDepth so we do not
+				// end up with empty elements
+				num := c.Intn(4)
+				for i := 0; i < num; i++ {
+					if v.Headers == nil {
+						v.Headers = make(map[string]Header)
+					}
+					hdr := Header{}
+					c.Fuzz(&hdr)
+					if hdr.Type == "" {
+						// hit maxDepth, just abort trying to make haders
+						v.Headers = nil
+						break
+					}
+					v.Headers[c.RandString()+"x"] = hdr
+				}
+			} else {
+				v.Headers = nil
+			}
+		}
+
+		v.Description = c.RandString() + "x"
+
+		// Gnostic parses empty as nil, so to keep avoid putting empty
+		if len(v.Headers) == 0 {
+			v.Headers = nil
+		}
+	},
+	func(v **Info, c fuzz.Continue) {
+		// Info is never nil
+		*v = &Info{}
+		c.FuzzNoCustom(*v)
+
+		(*v).Title = c.RandString() + "x"
+	},
+	func(v *Extensions, c fuzz.Continue) {
+		// gnostic parser only picks up x- vendor extensions
+		numChildren := c.Intn(5)
+		for i := 0; i < numChildren; i++ {
+			if *v == nil {
+				*v = Extensions{}
+			}
+			(*v)["x-"+c.RandString()] = c.RandString()
+		}
+	},
+	func(v *Swagger, c fuzz.Continue) {
+		c.FuzzNoCustom(v)
+
+		if v.Paths == nil {
+			// Force paths non-nil since it does not have omitempty in json tag.
+			// This means a perfect roundtrip (via json) is impossible,
+			// since we can't tell the difference between empty/unspecified paths
+			v.Paths = &Paths{}
+			c.Fuzz(v.Paths)
+		}
+
+		v.Swagger = "2.0"
+
+		// Gnostic support serializing ID at all
+		// unavoidable data loss
+		v.ID = ""
+
+		v.Schemes = nil
+		if c.RandUint64()%2 == 1 {
+			v.Schemes = append(v.Schemes, "http")
+		}
+
+		if c.RandUint64()%2 == 1 {
+			v.Schemes = append(v.Schemes, "https")
+		}
+
+		if c.RandUint64()%2 == 1 {
+			v.Schemes = append(v.Schemes, "ws")
+		}
+
+		if c.RandUint64()%2 == 1 {
+			v.Schemes = append(v.Schemes, "wss")
+		}
+
+		// Gnostic unconditionally makes security values non-null
+		// So do not fuzz null values into the array.
+		for i, val := range v.Security {
+			if val == nil {
+				v.Security[i] = make(map[string][]string)
+			}
+
+			for k, v := range val {
+				if v == nil {
+					val[k] = make([]string, 0)
+				}
+			}
+		}
+	},
+	func(v *SecurityScheme, c fuzz.Continue) {
+		v.Description = c.RandString() + "x"
+		c.Fuzz(&v.VendorExtensible)
+
+		switch c.Intn(3) {
+		case 0:
+			v.Type = "basic"
+		case 1:
+			v.Type = "apiKey"
+			switch c.Intn(2) {
+			case 0:
+				v.In = "header"
+			case 1:
+				v.In = "query"
+			default:
+				panic("unreachable")
+			}
+			v.Name = "x" + c.RandString()
+		case 2:
+			v.Type = "oauth2"
+
+			switch c.Intn(4) {
+			case 0:
+				v.Flow = "accessCode"
+				v.TokenURL = "https://" + c.RandString()
+				v.AuthorizationURL = "https://" + c.RandString()
+			case 1:
+				v.Flow = "application"
+				v.TokenURL = "https://" + c.RandString()
+			case 2:
+				v.Flow = "implicit"
+				v.AuthorizationURL = "https://" + c.RandString()
+			case 3:
+				v.Flow = "password"
+				v.TokenURL = "https://" + c.RandString()
+			default:
+				panic("unreachable")
+			}
+			c.Fuzz(&v.Scopes)
+		default:
+			panic("unreachable")
+		}
+	},
+	func(v *interface{}, c fuzz.Continue) {
+		*v = c.RandString() + "x"
+	},
+	func(v *string, c fuzz.Continue) {
+		*v = c.RandString() + "x"
+	},
+	func(v *ExternalDocumentation, c fuzz.Continue) {
+		v.Description = c.RandString() + "x"
+		v.URL = c.RandString() + "x"
+	},
+	func(v *SimpleSchema, c fuzz.Continue) {
+		c.FuzzNoCustom(v)
+
+		switch c.Intn(5) {
+		case 0:
+			v.Type = "string"
+		case 1:
+			v.Type = "number"
+		case 2:
+			v.Type = "boolean"
+		case 3:
+			v.Type = "integer"
+		case 4:
+			v.Type = "array"
+		default:
+			panic("unreachable")
+		}
+
+		switch c.Intn(5) {
+		case 0:
+			v.CollectionFormat = "csv"
+		case 1:
+			v.CollectionFormat = "ssv"
+		case 2:
+			v.CollectionFormat = "tsv"
+		case 3:
+			v.CollectionFormat = "pipes"
+		case 4:
+			v.CollectionFormat = ""
+		default:
+			panic("unreachable")
+		}
+
+		// None of the types which include SimpleSchema in our definitions
+		// actually support "example" in the official spec
+		v.Example = nil
+
+		// unsupported by openapi
+		v.Nullable = false
+	},
+	func(v *int64, c fuzz.Continue) {
+		c.Fuzz(v)
+
+		// Gnostic does not differentiate between 0 and non-specified
+		// so avoid using 0 for fuzzer
+		if *v == 0 {
+			*v = 1
+		}
+	},
+	func(v *float64, c fuzz.Continue) {
+		c.Fuzz(v)
+
+		// Gnostic does not differentiate between 0 and non-specified
+		// so avoid using 0 for fuzzer
+		if *v == 0.0 {
+			*v = 1.0
+		}
+	},
+	func(v *Parameter, c fuzz.Continue) {
+		if v == nil {
+			return
+		}
+		c.Fuzz(&v.VendorExtensible)
+		if c.RandBool() {
+			// body param
+			v.Description = c.RandString() + "x"
+			v.Name = c.RandString() + "x"
+			v.In = "body"
+			c.Fuzz(&v.Description)
+			c.Fuzz(&v.Required)
+
+			v.Schema = &Schema{}
+			c.Fuzz(&v.Schema)
+
+		} else {
+			c.Fuzz(&v.SimpleSchema)
+			c.Fuzz(&v.CommonValidations)
+			v.AllowEmptyValue = false
+			v.Description = c.RandString() + "x"
+			v.Name = c.RandString() + "x"
+
+			switch c.Intn(4) {
+			case 0:
+				// Header param
+				v.In = "header"
+			case 1:
+				// Form data param
+				v.In = "formData"
+				v.AllowEmptyValue = c.RandBool()
+			case 2:
+				// Query param
+				v.In = "query"
+				v.AllowEmptyValue = c.RandBool()
+			case 3:
+				// Path param
+				v.In = "path"
+				v.Required = true
+			default:
+				panic("unreachable")
+			}
+
+			// descendant Items of Parameter may not be refs
+			cur := v.Items
+			for cur != nil {
+				cur.Ref = Ref{}
+				cur = cur.Items
+			}
+		}
+	},
+	func(v *Schema, c fuzz.Continue) {
+		if c.RandBool() {
+			// file schema
+			c.Fuzz(&v.Default)
+			c.Fuzz(&v.Description)
+			c.Fuzz(&v.Example)
+			c.Fuzz(&v.ExternalDocs)
+
+			c.Fuzz(&v.Format)
+			c.Fuzz(&v.ReadOnly)
+			c.Fuzz(&v.Required)
+			c.Fuzz(&v.Title)
+			v.Type = StringOrArray{"file"}
+
+		} else {
+			// normal schema
+			c.Fuzz(&v.SchemaProps)
+			c.Fuzz(&v.SwaggerSchemaProps)
+			c.Fuzz(&v.VendorExtensible)
+			// c.Fuzz(&v.ExtraProps)
+			// ExtraProps will not roundtrip - gnostic throws out
+			// unrecognized keys
+		}
+
+		// Not supported by official openapi v2 spec
+		// and stripped by k8s apiserver
+		v.ID = ""
+		v.AnyOf = nil
+		v.OneOf = nil
+		v.Not = nil
+		v.Nullable = false
+		v.AdditionalItems = nil
+		v.Schema = ""
+		v.PatternProperties = nil
+		v.Definitions = nil
+		v.Dependencies = nil
+	},
+}
+
+var SwaggerDiffOptions = []cmp.Option{
+	// cmp.Diff panics on Ref since jsonreference.Ref uses unexported fields
+	cmp.Comparer(func(a Ref, b Ref) bool {
+		return a.String() == b.String()
+	}),
+}

vendor/k8s.io/kube-openapi/pkg/validation/spec/gnostic.go

@@ -219,8 +219,8 @@ func (k *Ref) FromGnostic(g string) error {
 // Caveats:
 //
 // - gnostic v2 documents treats zero as unspecified for numerical fields of
-//CommonValidations fields such as Maximum, Minimum, MaximumItems, etc.
+// CommonValidations fields such as Maximum, Minimum, MaximumItems, etc.
-//There will always be data loss if one of the values of these fields is set to zero.
+// There will always be data loss if one of the values of these fields is set to zero.
 //
 // Returns:
 //
@@ -1263,6 +1263,8 @@ func (k *Schema) FromGnostic(g *openapi_v2.Schema) (ok bool, err error) {
 			k.AdditionalProperties.Allows = g.AdditionalProperties.GetBoolean()
 		} else {
 			k.AdditionalProperties.Schema = &Schema{}
+			k.AdditionalProperties.Allows = true
+
 			if nok, err := k.AdditionalProperties.Schema.FromGnostic(g.AdditionalProperties.GetSchema()); err != nil {
 				return false, err
 			} else if !nok {

vendor/k8s.io/kube-openapi/pkg/validation/spec/header.go

@@ -18,6 +18,8 @@ import (
 	"encoding/json"
 
 	"github.com/go-openapi/swag"
+	"k8s.io/kube-openapi/pkg/internal"
+	jsonv2 "k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json"
 )
 
 const (
@@ -62,6 +64,10 @@ func (h Header) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON unmarshals this header from JSON
 func (h *Header) UnmarshalJSON(data []byte) error {
+	if internal.UseOptimizedJSONUnmarshaling {
+		return jsonv2.Unmarshal(data, h)
+	}
+
 	if err := json.Unmarshal(data, &h.CommonValidations); err != nil {
 		return err
 	}
@@ -73,3 +79,27 @@ func (h *Header) UnmarshalJSON(data []byte) error {
 	}
 	return json.Unmarshal(data, &h.HeaderProps)
 }
+
+func (h *Header) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) error {
+	var x struct {
+		CommonValidations
+		SimpleSchema
+		Extensions
+		HeaderProps
+	}
+
+	if err := opts.UnmarshalNext(dec, &x); err != nil {
+		return err
+	}
+
+	h.CommonValidations = x.CommonValidations
+	h.SimpleSchema = x.SimpleSchema
+	h.Extensions = x.Extensions
+	h.HeaderProps = x.HeaderProps
+
+	h.Extensions.sanitize()
+	if len(h.Extensions) == 0 {
+		h.Extensions = nil
+	}
+	return nil
+}

vendor/k8s.io/kube-openapi/pkg/validation/spec/info.go

@@ -19,6 +19,8 @@ import (
 	"strings"
 
 	"github.com/go-openapi/swag"
+	"k8s.io/kube-openapi/pkg/internal"
+	jsonv2 "k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json"
 )
 
 // Extensions vendor specific extensions
@@ -87,6 +89,31 @@ func (e Extensions) GetObject(key string, out interface{}) error {
 	return nil
 }
 
+func (e Extensions) sanitize() {
+	for k := range e {
+		if !isExtensionKey(k) {
+			delete(e, k)
+		}
+	}
+}
+
+func (e Extensions) sanitizeWithExtra() (extra map[string]any) {
+	for k, v := range e {
+		if !isExtensionKey(k) {
+			if extra == nil {
+				extra = make(map[string]any)
+			}
+			extra[k] = v
+			delete(e, k)
+		}
+	}
+	return extra
+}
+
+func isExtensionKey(k string) bool {
+	return len(k) > 1 && (k[0] == 'x' || k[0] == 'X') && k[1] == '-'
+}
+
 // VendorExtensible composition block.
 type VendorExtensible struct {
 	Extensions Extensions
@@ -167,8 +194,29 @@ func (i Info) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON marshal this from JSON
 func (i *Info) UnmarshalJSON(data []byte) error {
+	if internal.UseOptimizedJSONUnmarshaling {
+		return jsonv2.Unmarshal(data, i)
+	}
+
 	if err := json.Unmarshal(data, &i.InfoProps); err != nil {
 		return err
 	}
 	return json.Unmarshal(data, &i.VendorExtensible)
 }
+
+func (i *Info) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) error {
+	var x struct {
+		Extensions
+		InfoProps
+	}
+	if err := opts.UnmarshalNext(dec, &x); err != nil {
+		return err
+	}
+	x.Extensions.sanitize()
+	if len(x.Extensions) == 0 {
+		x.Extensions = nil
+	}
+	i.VendorExtensible.Extensions = x.Extensions
+	i.InfoProps = x.InfoProps
+	return nil
+}

vendor/k8s.io/kube-openapi/pkg/validation/spec/items.go

@@ -18,6 +18,8 @@ import (
 	"encoding/json"
 
 	"github.com/go-openapi/swag"
+	"k8s.io/kube-openapi/pkg/internal"
+	jsonv2 "k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json"
 )
 
 const (
@@ -64,6 +66,10 @@ type Items struct {
 
 // UnmarshalJSON hydrates this items instance with the data from JSON
 func (i *Items) UnmarshalJSON(data []byte) error {
+	if internal.UseOptimizedJSONUnmarshaling {
+		return jsonv2.Unmarshal(data, i)
+	}
+
 	var validations CommonValidations
 	if err := json.Unmarshal(data, &validations); err != nil {
 		return err
@@ -87,6 +93,28 @@ func (i *Items) UnmarshalJSON(data []byte) error {
 	return nil
 }
 
+func (i *Items) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) error {
+	var x struct {
+		CommonValidations
+		SimpleSchema
+		Extensions
+	}
+	if err := opts.UnmarshalNext(dec, &x); err != nil {
+		return err
+	}
+	if err := i.Refable.Ref.fromMap(x.Extensions); err != nil {
+		return err
+	}
+	x.Extensions.sanitize()
+	if len(x.Extensions) == 0 {
+		x.Extensions = nil
+	}
+	i.CommonValidations = x.CommonValidations
+	i.SimpleSchema = x.SimpleSchema
+	i.VendorExtensible.Extensions = x.Extensions
+	return nil
+}
+
 // MarshalJSON converts this items object to JSON
 func (i Items) MarshalJSON() ([]byte, error) {
 	b1, err := json.Marshal(i.CommonValidations)

vendor/k8s.io/kube-openapi/pkg/validation/spec/operation.go

@@ -18,6 +18,8 @@ import (
 	"encoding/json"
 
 	"github.com/go-openapi/swag"
+	"k8s.io/kube-openapi/pkg/internal"
+	jsonv2 "k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json"
 )
 
 // OperationProps describes an operation
@@ -75,12 +77,34 @@ type Operation struct {
 
 // UnmarshalJSON hydrates this items instance with the data from JSON
 func (o *Operation) UnmarshalJSON(data []byte) error {
+	if internal.UseOptimizedJSONUnmarshaling {
+		return jsonv2.Unmarshal(data, o)
+	}
+
 	if err := json.Unmarshal(data, &o.OperationProps); err != nil {
 		return err
 	}
 	return json.Unmarshal(data, &o.VendorExtensible)
 }
 
+func (o *Operation) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) error {
+	type OperationPropsNoMethods OperationProps // strip MarshalJSON method
+	var x struct {
+		Extensions
+		OperationPropsNoMethods
+	}
+	if err := opts.UnmarshalNext(dec, &x); err != nil {
+		return err
+	}
+	x.Extensions.sanitize()
+	if len(x.Extensions) == 0 {
+		x.Extensions = nil
+	}
+	o.VendorExtensible.Extensions = x.Extensions
+	o.OperationProps = OperationProps(x.OperationPropsNoMethods)
+	return nil
+}
+
 // MarshalJSON converts this items object to JSON
 func (o Operation) MarshalJSON() ([]byte, error) {
 	b1, err := json.Marshal(o.OperationProps)

vendor/k8s.io/kube-openapi/pkg/validation/spec/parameter.go

@@ -18,6 +18,8 @@ import (
 	"encoding/json"
 
 	"github.com/go-openapi/swag"
+	"k8s.io/kube-openapi/pkg/internal"
+	jsonv2 "k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json"
 )
 
 // ParamProps describes the specific attributes of an operation parameter
@@ -38,15 +40,20 @@ type ParamProps struct {
 //
 // There are five possible parameter types.
 // * Path - Used together with [Path Templating](#pathTemplating), where the parameter value is actually part
+//
 //	of the operation's URL. This does not include the host or base path of the API. For example, in `/items/{itemId}`,
 //	the path parameter is `itemId`.
+//
 // * Query - Parameters that are appended to the URL. For example, in `/items?id=###`, the query parameter is `id`.
 // * Header - Custom headers that are expected as part of the request.
 // * Body - The payload that's appended to the HTTP request. Since there can only be one payload, there can only be
+//
 //	_one_ body parameter. The name of the body parameter has no effect on the parameter itself and is used for
 //	documentation purposes only. Since Form parameters are also in the payload, body and form parameters cannot exist
 //	together for the same operation.
+//
 // * Form - Used to describe the payload of an HTTP request when either `application/x-www-form-urlencoded` or
+//
 //	`multipart/form-data` are used as the content type of the request (in Swagger's definition,
 //	the [`consumes`](#operationConsumes) property of an operation). This is the only parameter type that can be used
 //	to send files, thus supporting the `file` type. Since form parameters are sent in the payload, they cannot be
@@ -70,6 +77,10 @@ type Parameter struct {
 
 // UnmarshalJSON hydrates this items instance with the data from JSON
 func (p *Parameter) UnmarshalJSON(data []byte) error {
+	if internal.UseOptimizedJSONUnmarshaling {
+		return jsonv2.Unmarshal(data, p)
+	}
+
 	if err := json.Unmarshal(data, &p.CommonValidations); err != nil {
 		return err
 	}
@@ -85,6 +96,30 @@ func (p *Parameter) UnmarshalJSON(data []byte) error {
 	return json.Unmarshal(data, &p.ParamProps)
 }
 
+func (p *Parameter) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) error {
+	var x struct {
+		CommonValidations
+		SimpleSchema
+		Extensions
+		ParamProps
+	}
+	if err := opts.UnmarshalNext(dec, &x); err != nil {
+		return err
+	}
+	if err := p.Refable.Ref.fromMap(x.Extensions); err != nil {
+		return err
+	}
+	x.Extensions.sanitize()
+	if len(x.Extensions) == 0 {
+		x.Extensions = nil
+	}
+	p.CommonValidations = x.CommonValidations
+	p.SimpleSchema = x.SimpleSchema
+	p.VendorExtensible.Extensions = x.Extensions
+	p.ParamProps = x.ParamProps
+	return nil
+}
+
 // MarshalJSON converts this items object to JSON
 func (p Parameter) MarshalJSON() ([]byte, error) {
 	b1, err := json.Marshal(p.CommonValidations)

vendor/k8s.io/kube-openapi/pkg/validation/spec/path_item.go

@@ -18,6 +18,8 @@ import (
 	"encoding/json"
 
 	"github.com/go-openapi/swag"
+	"k8s.io/kube-openapi/pkg/internal"
+	jsonv2 "k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json"
 )
 
 // PathItemProps the path item specific properties
@@ -46,6 +48,10 @@ type PathItem struct {
 
 // UnmarshalJSON hydrates this items instance with the data from JSON
 func (p *PathItem) UnmarshalJSON(data []byte) error {
+	if internal.UseOptimizedJSONUnmarshaling {
+		return jsonv2.Unmarshal(data, p)
+	}
+
 	if err := json.Unmarshal(data, &p.Refable); err != nil {
 		return err
 	}
@@ -55,6 +61,31 @@ func (p *PathItem) UnmarshalJSON(data []byte) error {
 	return json.Unmarshal(data, &p.PathItemProps)
 }
 
+func (p *PathItem) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) error {
+	var x struct {
+		Extensions
+		PathItemProps
+	}
+
+	if err := opts.UnmarshalNext(dec, &x); err != nil {
+		return err
+	}
+
+	p.Extensions = x.Extensions
+	p.PathItemProps = x.PathItemProps
+
+	if err := p.Refable.Ref.fromMap(p.Extensions); err != nil {
+		return err
+	}
+
+	p.Extensions.sanitize()
+	if len(p.Extensions) == 0 {
+		p.Extensions = nil
+	}
+
+	return nil
+}
+
 // MarshalJSON converts this items object to JSON
 func (p PathItem) MarshalJSON() ([]byte, error) {
 	b3, err := json.Marshal(p.Refable)

vendor/k8s.io/kube-openapi/pkg/validation/spec/paths.go

@@ -16,9 +16,12 @@ package spec
 
 import (
 	"encoding/json"
+	"fmt"
 	"strings"
 
 	"github.com/go-openapi/swag"
+	"k8s.io/kube-openapi/pkg/internal"
+	jsonv2 "k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json"
 )
 
 // Paths holds the relative paths to the individual endpoints.
@@ -34,6 +37,10 @@ type Paths struct {
 
 // UnmarshalJSON hydrates this items instance with the data from JSON
 func (p *Paths) UnmarshalJSON(data []byte) error {
+	if internal.UseOptimizedJSONUnmarshaling {
+		return jsonv2.Unmarshal(data, p)
+	}
+
 	var res map[string]json.RawMessage
 	if err := json.Unmarshal(data, &res); err != nil {
 		return err
@@ -63,6 +70,58 @@ func (p *Paths) UnmarshalJSON(data []byte) error {
 	return nil
 }
 
+func (p *Paths) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) error {
+	tok, err := dec.ReadToken()
+	if err != nil {
+		return err
+	}
+	var ext any
+	var pi PathItem
+	switch k := tok.Kind(); k {
+	case 'n':
+		return nil // noop
+	case '{':
+		for {
+			tok, err := dec.ReadToken()
+			if err != nil {
+				return err
+			}
+
+			if tok.Kind() == '}' {
+				return nil
+			}
+
+			switch k := tok.String(); {
+			case isExtensionKey(k):
+				ext = nil
+				if err := opts.UnmarshalNext(dec, &ext); err != nil {
+					return err
+				}
+
+				if p.Extensions == nil {
+					p.Extensions = make(map[string]any)
+				}
+				p.Extensions[k] = ext
+			case len(k) > 0 && k[0] == '/':
+				pi = PathItem{}
+				if err := opts.UnmarshalNext(dec, &pi); err != nil {
+					return err
+				}
+
+				if p.Paths == nil {
+					p.Paths = make(map[string]PathItem)
+				}
+				p.Paths[k] = pi
+			default:
+				_, err := dec.ReadValue() // skip value
+				return err
+			}
+		}
+	default:
+		return fmt.Errorf("unknown JSON kind: %v", k)
+	}
+}
+
 // MarshalJSON converts this items object to JSON
 func (p Paths) MarshalJSON() ([]byte, error) {
 	b1, err := json.Marshal(p.VendorExtensible)

vendor/k8s.io/kube-openapi/pkg/validation/spec/response.go

@@ -18,6 +18,8 @@ import (
 	"encoding/json"
 
 	"github.com/go-openapi/swag"
+	"k8s.io/kube-openapi/pkg/internal"
+	jsonv2 "k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json"
 )
 
 // ResponseProps properties specific to a response
@@ -39,13 +41,46 @@ type Response struct {
 
 // UnmarshalJSON hydrates this items instance with the data from JSON
 func (r *Response) UnmarshalJSON(data []byte) error {
+	if internal.UseOptimizedJSONUnmarshaling {
+		return jsonv2.Unmarshal(data, r)
+	}
+
 	if err := json.Unmarshal(data, &r.ResponseProps); err != nil {
 		return err
 	}
 	if err := json.Unmarshal(data, &r.Refable); err != nil {
 		return err
 	}
-	return json.Unmarshal(data, &r.VendorExtensible)
+	if err := json.Unmarshal(data, &r.VendorExtensible); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (r *Response) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) error {
+	var x struct {
+		ResponseProps
+		Extensions
+	}
+
+	if err := opts.UnmarshalNext(dec, &x); err != nil {
+		return err
+	}
+
+	r.Extensions = x.Extensions
+	r.ResponseProps = x.ResponseProps
+
+	if err := r.Refable.Ref.fromMap(r.Extensions); err != nil {
+		return err
+	}
+
+	r.Extensions.sanitize()
+	if len(r.Extensions) == 0 {
+		r.Extensions = nil
+	}
+
+	return nil
 }
 
 // MarshalJSON converts this items object to JSON

vendor/k8s.io/kube-openapi/pkg/validation/spec/responses.go

@@ -16,10 +16,13 @@ package spec
 
 import (
 	"encoding/json"
+	"fmt"
 	"reflect"
 	"strconv"
 
 	"github.com/go-openapi/swag"
+	"k8s.io/kube-openapi/pkg/internal"
+	jsonv2 "k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json"
 )
 
 // Responses is a container for the expected responses of an operation.
@@ -42,6 +45,10 @@ type Responses struct {
 
 // UnmarshalJSON hydrates this items instance with the data from JSON
 func (r *Responses) UnmarshalJSON(data []byte) error {
+	if internal.UseOptimizedJSONUnmarshaling {
+		return jsonv2.Unmarshal(data, r)
+	}
+
 	if err := json.Unmarshal(data, &r.ResponsesProps); err != nil {
 		return err
 	}
@@ -90,21 +97,90 @@ func (r ResponsesProps) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON unmarshals responses from JSON
 func (r *ResponsesProps) UnmarshalJSON(data []byte) error {
-	var res map[string]Response
+	if internal.UseOptimizedJSONUnmarshaling {
+		return jsonv2.Unmarshal(data, r)
+	}
+	var res map[string]json.RawMessage
 	if err := json.Unmarshal(data, &res); err != nil {
-		return nil
+		return err
 	}
 	if v, ok := res["default"]; ok {
-		r.Default = &v
+		value := Response{}
+		if err := json.Unmarshal(v, &value); err != nil {
+			return err
+		}
+		r.Default = &value
 		delete(res, "default")
 	}
 	for k, v := range res {
+		// Take all integral keys
 		if nk, err := strconv.Atoi(k); err == nil {
 			if r.StatusCodeResponses == nil {
 				r.StatusCodeResponses = map[int]Response{}
 			}
-			r.StatusCodeResponses[nk] = v
+			value := Response{}
+			if err := json.Unmarshal(v, &value); err != nil {
+				return err
+			}
+			r.StatusCodeResponses[nk] = value
 		}
 	}
 	return nil
 }
+
+func (r *Responses) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) (err error) {
+	tok, err := dec.ReadToken()
+	if err != nil {
+		return err
+	}
+	var ext any
+	var resp Response
+	switch k := tok.Kind(); k {
+	case 'n':
+		return nil // noop
+	case '{':
+		for {
+			tok, err := dec.ReadToken()
+			if err != nil {
+				return err
+			}
+			if tok.Kind() == '}' {
+				return nil
+			}
+			switch k := tok.String(); {
+			case isExtensionKey(k):
+				ext = nil
+				if err := opts.UnmarshalNext(dec, &ext); err != nil {
+					return err
+				}
+
+				if r.Extensions == nil {
+					r.Extensions = make(map[string]any)
+				}
+				r.Extensions[k] = ext
+			case k == "default":
+				resp = Response{}
+				if err := opts.UnmarshalNext(dec, &resp); err != nil {
+					return err
+				}
+
+				respCopy := resp
+				r.ResponsesProps.Default = &respCopy
+			default:
+				if nk, err := strconv.Atoi(k); err == nil {
+					resp = Response{}
+					if err := opts.UnmarshalNext(dec, &resp); err != nil {
+						return err
+					}
+
+					if r.StatusCodeResponses == nil {
+						r.StatusCodeResponses = map[int]Response{}
+					}
+					r.StatusCodeResponses[nk] = resp
+				}
+			}
+		}
+	default:
+		return fmt.Errorf("unknown JSON kind: %v", k)
+	}
+}

vendor/k8s.io/kube-openapi/pkg/validation/spec/schema.go

@@ -21,6 +21,8 @@ import (
 	"strings"
 
 	"github.com/go-openapi/swag"
+	"k8s.io/kube-openapi/pkg/internal"
+	jsonv2 "k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json"
 )
 
 // BooleanProperty creates a boolean property
@@ -465,6 +467,10 @@ func (s Schema) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON marshal this from JSON
 func (s *Schema) UnmarshalJSON(data []byte) error {
+	if internal.UseOptimizedJSONUnmarshaling {
+		return jsonv2.Unmarshal(data, s)
+	}
+
 	props := struct {
 		SchemaProps
 		SwaggerSchemaProps
@@ -511,3 +517,38 @@ func (s *Schema) UnmarshalJSON(data []byte) error {
 
 	return nil
 }
+
+func (s *Schema) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) error {
+	var x struct {
+		Extensions
+		SchemaProps
+		SwaggerSchemaProps
+	}
+	if err := opts.UnmarshalNext(dec, &x); err != nil {
+		return err
+	}
+
+	if err := x.Ref.fromMap(x.Extensions); err != nil {
+		return err
+	}
+
+	if err := x.Schema.fromMap(x.Extensions); err != nil {
+		return err
+	}
+
+	delete(x.Extensions, "$ref")
+	delete(x.Extensions, "$schema")
+
+	for _, pn := range swag.DefaultJSONNameProvider.GetJSONNames(s) {
+		delete(x.Extensions, pn)
+	}
+	if len(x.Extensions) == 0 {
+		x.Extensions = nil
+	}
+
+	s.ExtraProps = x.Extensions.sanitizeWithExtra()
+	s.VendorExtensible.Extensions = x.Extensions
+	s.SchemaProps = x.SchemaProps
+	s.SwaggerSchemaProps = x.SwaggerSchemaProps
+	return nil
+}

vendor/k8s.io/kube-openapi/pkg/validation/spec/security_scheme.go

@@ -18,6 +18,7 @@ import (
 	"encoding/json"
 
 	"github.com/go-openapi/swag"
+	jsonv2 "k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json"
 )
 
 // SecuritySchemeProps describes a swagger security scheme in the securityDefinitions section
@@ -62,3 +63,20 @@ func (s *SecurityScheme) UnmarshalJSON(data []byte) error {
 	}
 	return json.Unmarshal(data, &s.VendorExtensible)
 }
+
+func (s *SecurityScheme) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) error {
+	var x struct {
+		Extensions
+		SecuritySchemeProps
+	}
+	if err := opts.UnmarshalNext(dec, &x); err != nil {
+		return err
+	}
+	x.Extensions.sanitize()
+	if len(x.Extensions) == 0 {
+		x.Extensions = nil
+	}
+	s.VendorExtensible.Extensions = x.Extensions
+	s.SecuritySchemeProps = x.SecuritySchemeProps
+	return nil
+}

vendor/k8s.io/kube-openapi/pkg/validation/spec/swagger.go

@@ -19,6 +19,8 @@ import (
 	"fmt"
 
 	"github.com/go-openapi/swag"
+	"k8s.io/kube-openapi/pkg/internal"
+	jsonv2 "k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json"
 )
 
 // Swagger this is the root document object for the API specification.
@@ -46,6 +48,10 @@ func (s Swagger) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON unmarshals a swagger spec from json
 func (s *Swagger) UnmarshalJSON(data []byte) error {
+	if internal.UseOptimizedJSONUnmarshaling {
+		return jsonv2.Unmarshal(data, s)
+	}
+
 	var sw Swagger
 	if err := json.Unmarshal(data, &sw.SwaggerProps); err != nil {
 		return err
@@ -57,6 +63,30 @@ func (s *Swagger) UnmarshalJSON(data []byte) error {
 	return nil
 }
 
+func (s *Swagger) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) error {
+	// Note: If you're willing to make breaking changes, it is possible to
+	// optimize this and other usages of this pattern:
+	// https://github.com/kubernetes/kube-openapi/pull/319#discussion_r983165948
+	var x struct {
+		Extensions
+		SwaggerProps
+	}
+
+	if err := opts.UnmarshalNext(dec, &x); err != nil {
+		return err
+	}
+
+	s.Extensions = x.Extensions
+	s.SwaggerProps = x.SwaggerProps
+
+	s.Extensions.sanitize()
+	if len(s.Extensions) == 0 {
+		s.Extensions = nil
+	}
+
+	return nil
+}
+
 // SwaggerProps captures the top-level properties of an Api specification
 //
 // NOTE: validation rules
@@ -108,6 +138,10 @@ func (s SchemaOrBool) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON converts this bool or schema object from a JSON structure
 func (s *SchemaOrBool) UnmarshalJSON(data []byte) error {
+	if internal.UseOptimizedJSONUnmarshaling {
+		return jsonv2.Unmarshal(data, s)
+	}
+
 	var nw SchemaOrBool
 	if len(data) >= 4 {
 		if data[0] == '{' {
@@ -123,6 +157,26 @@ func (s *SchemaOrBool) UnmarshalJSON(data []byte) error {
 	return nil
 }
 
+func (s *SchemaOrBool) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) error {
+	switch k := dec.PeekKind(); k {
+	case '{':
+		err := opts.UnmarshalNext(dec, &s.Schema)
+		if err != nil {
+			return err
+		}
+		s.Allows = true
+		return nil
+	case 't', 'f':
+		err := opts.UnmarshalNext(dec, &s.Allows)
+		if err != nil {
+			return err
+		}
+		return nil
+	default:
+		return fmt.Errorf("expected object or bool, not '%v'", k.String())
+	}
+}
+
 // SchemaOrStringArray represents a schema or a string array
 type SchemaOrStringArray struct {
 	Schema   *Schema
@@ -142,6 +196,10 @@ func (s SchemaOrStringArray) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON converts this schema object or array from a JSON structure
 func (s *SchemaOrStringArray) UnmarshalJSON(data []byte) error {
+	if internal.UseOptimizedJSONUnmarshaling {
+		return jsonv2.Unmarshal(data, s)
+	}
+
 	var first byte
 	if len(data) > 1 {
 		first = data[0]
@@ -163,6 +221,18 @@ func (s *SchemaOrStringArray) UnmarshalJSON(data []byte) error {
 	return nil
 }
 
+func (s *SchemaOrStringArray) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) error {
+	switch dec.PeekKind() {
+	case '{':
+		return opts.UnmarshalNext(dec, &s.Schema)
+	case '[':
+		return opts.UnmarshalNext(dec, &s.Property)
+	default:
+		_, err := dec.ReadValue()
+		return err
+	}
+}
+
 // Definitions contains the models explicitly defined in this spec
 // An object to hold data types that can be consumed and produced by operations.
 // These data types can be primitives, arrays or models.
@@ -193,6 +263,10 @@ func (s StringOrArray) Contains(value string) bool {
 
 // UnmarshalJSON unmarshals this string or array object from a JSON array or JSON string
 func (s *StringOrArray) UnmarshalJSON(data []byte) error {
+	if internal.UseOptimizedJSONUnmarshaling {
+		return jsonv2.Unmarshal(data, s)
+	}
+
 	var first byte
 	if len(data) > 1 {
 		first = data[0]
@@ -223,6 +297,23 @@ func (s *StringOrArray) UnmarshalJSON(data []byte) error {
 	}
 }
 
+func (s *StringOrArray) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) error {
+	switch k := dec.PeekKind(); k {
+	case '[':
+		*s = StringOrArray{}
+		return opts.UnmarshalNext(dec, (*[]string)(s))
+	case '"':
+		*s = StringOrArray{""}
+		return opts.UnmarshalNext(dec, &(*s)[0])
+	case 'n':
+		// Throw out null token
+		_, _ = dec.ReadToken()
+		return nil
+	default:
+		return fmt.Errorf("expected string or array, not '%v'", k.String())
+	}
+}
+
 // MarshalJSON converts this string or array to a JSON array or JSON string
 func (s StringOrArray) MarshalJSON() ([]byte, error) {
 	if len(s) == 1 {
@@ -264,6 +355,10 @@ func (s SchemaOrArray) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON converts this schema object or array from a JSON structure
 func (s *SchemaOrArray) UnmarshalJSON(data []byte) error {
+	if internal.UseOptimizedJSONUnmarshaling {
+		return jsonv2.Unmarshal(data, s)
+	}
+
 	var nw SchemaOrArray
 	var first byte
 	if len(data) > 1 {
@@ -284,3 +379,15 @@ func (s *SchemaOrArray) UnmarshalJSON(data []byte) error {
 	*s = nw
 	return nil
 }
+
+func (s *SchemaOrArray) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) error {
+	switch dec.PeekKind() {
+	case '{':
+		return opts.UnmarshalNext(dec, &s.Schema)
+	case '[':
+		return opts.UnmarshalNext(dec, &s.Schemas)
+	default:
+		_, err := dec.ReadValue()
+		return err
+	}
+}

vendor/k8s.io/kube-openapi/pkg/validation/spec/tag.go

@@ -18,6 +18,8 @@ import (
 	"encoding/json"
 
 	"github.com/go-openapi/swag"
+	"k8s.io/kube-openapi/pkg/internal"
+	jsonv2 "k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json"
 )
 
 // TagProps describe a tag entry in the top level tags section of a swagger spec
@@ -52,8 +54,29 @@ func (t Tag) MarshalJSON() ([]byte, error) {
 
 // UnmarshalJSON marshal this from JSON
 func (t *Tag) UnmarshalJSON(data []byte) error {
+	if internal.UseOptimizedJSONUnmarshaling {
+		return jsonv2.Unmarshal(data, t)
+	}
+
 	if err := json.Unmarshal(data, &t.TagProps); err != nil {
 		return err
 	}
 	return json.Unmarshal(data, &t.VendorExtensible)
 }
+
+func (t *Tag) UnmarshalNextJSON(opts jsonv2.UnmarshalOptions, dec *jsonv2.Decoder) error {
+	var x struct {
+		Extensions
+		TagProps
+	}
+	if err := opts.UnmarshalNext(dec, &x); err != nil {
+		return err
+	}
+	x.Extensions.sanitize()
+	if len(x.Extensions) == 0 {
+		x.Extensions = nil
+	}
+	t.VendorExtensible.Extensions = x.Extensions
+	t.TagProps = x.TagProps
+	return nil
+}

vendor/modules.txt

@@ -378,8 +378,8 @@ github.com/kubernetes-csi/csi-lib-utils/connection
 github.com/kubernetes-csi/csi-lib-utils/metrics
 github.com/kubernetes-csi/csi-lib-utils/protosanitizer
 github.com/kubernetes-csi/csi-lib-utils/rpc
-# github.com/kubernetes-csi/external-snapshotter/client/v6 v6.1.0
+# github.com/kubernetes-csi/external-snapshotter/client/v6 v6.2.0
-## explicit; go 1.18
+## explicit; go 1.19
 github.com/kubernetes-csi/external-snapshotter/client/v6/apis/volumesnapshot/v1
 github.com/kubernetes-csi/external-snapshotter/client/v6/clientset/versioned/scheme
 github.com/kubernetes-csi/external-snapshotter/client/v6/clientset/versioned/typed/volumesnapshot/v1
@@ -800,7 +800,7 @@ gopkg.in/yaml.v2
 # gopkg.in/yaml.v3 v3.0.1
 ## explicit
 gopkg.in/yaml.v3
-# k8s.io/api v0.25.4 => k8s.io/api v0.25.4
+# k8s.io/api v0.26.0 => k8s.io/api v0.25.4
 ## explicit; go 1.19
 k8s.io/api/admission/v1
 k8s.io/api/admission/v1beta1
@@ -854,7 +854,7 @@ k8s.io/api/storage/v1beta1
 ## explicit; go 1.19
 k8s.io/apiextensions-apiserver/pkg/apis/apiextensions
 k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1
-# k8s.io/apimachinery v0.25.4 => k8s.io/apimachinery v0.25.4
+# k8s.io/apimachinery v0.26.0 => k8s.io/apimachinery v0.25.4
 ## explicit; go 1.19
 k8s.io/apimachinery/pkg/api/equality
 k8s.io/apimachinery/pkg/api/errors
@@ -1229,12 +1229,14 @@ k8s.io/klog/v2/internal/clock
 k8s.io/klog/v2/internal/dbg
 k8s.io/klog/v2/internal/serialize
 k8s.io/klog/v2/internal/severity
-# k8s.io/kube-openapi v0.0.0-20220803164354-a70c9af30aea
+# k8s.io/kube-openapi v0.0.0-20221012153701-172d655c2280
 ## explicit; go 1.18
 k8s.io/kube-openapi/pkg/builder3/util
 k8s.io/kube-openapi/pkg/common
 k8s.io/kube-openapi/pkg/handler3
+k8s.io/kube-openapi/pkg/internal
 k8s.io/kube-openapi/pkg/internal/handler
+k8s.io/kube-openapi/pkg/internal/third_party/go-json-experiment/json
 k8s.io/kube-openapi/pkg/openapiconv
 k8s.io/kube-openapi/pkg/schemaconv
 k8s.io/kube-openapi/pkg/schemamutation