Check that the x-kubernetes-group-version-kind keyword works
even when the kind and apiVersion properties aren't defined.

#version: k8sAPI

-- schema.json --
{
  "components": {
    "schemas": {
      "io.k8s.apimachinery.pkg.apis.meta.v1.APIVersions": {
        "properties": {
          "serverAddressByClientCIDRs": {
            "items": {
              "allOf": [
                {
                  "$ref": "#/components/schemas/io.k8s.apimachinery.pkg.apis.meta.v1.ServerAddressByClientCIDR"
                }
              ],
              "default": {}
            },
            "type": "array",
            "x-kubernetes-list-type": "atomic"
          },
          "versions": {
            "items": {
              "default": "",
              "type": "string"
            },
            "type": "array",
            "x-kubernetes-list-type": "atomic"
          }
        },
        "required": [
          "versions",
          "serverAddressByClientCIDRs"
        ],
        "type": "object",
        "x-kubernetes-group-version-kind": [
          {
            "group": "",
            "kind": "APIVersions",
            "version": "v1"
          }
        ]
      },
      "io.k8s.apimachinery.pkg.apis.meta.v1.ServerAddressByClientCIDR": {
        "properties": {
          "clientCIDR": {
            "default": "",
            "type": "string"
          },
          "serverAddress": {
            "default": "",
            "type": "string"
          }
        },
        "required": [
          "clientCIDR",
          "serverAddress"
        ],
        "type": "object"
      }
    },
    "securitySchemes": {
      "BearerToken": {
        "in": "header",
        "name": "authorization",
        "type": "apiKey"
      }
    }
  },
  "info": {
    "title": "Kubernetes",
    "version": "unversioned"
  },
  "openapi": "3.0.0",
  "paths": {}
}
-- out/decode/extract --
_#defs: "/components/schemas/io.k8s.apimachinery.pkg.apis.meta.v1.APIVersions": {
	serverAddressByClientCIDRs!: [..._#defs."/components/schemas/io.k8s.apimachinery.pkg.apis.meta.v1.ServerAddressByClientCIDR"]
	versions!: [...string]
	apiVersion: "v1"
	kind:       "APIVersions"
}

_#defs: "/components/schemas/io.k8s.apimachinery.pkg.apis.meta.v1.ServerAddressByClientCIDR": {
	clientCIDR!:    string
	serverAddress!: string
}
