s.WriteString(err.Error())
	}
	return s.String()
}

func (e *strictDecodingError) Errors() []error {
	return e.errors
}

// IsStrictDecodingError returns true if the error indicates that the provided object
// strictness violations.
func IsStrictDecodingError(err error) bool {
	if err == nil {
		return false
	}
	_, ok := err.(*strictDecodingError)
	return ok
}

	// Try strict decoding first.
	_, gvk, err := strictDecoder.Decode(policyDef, nil, policy)
	if err != nil {
		if !runtime.IsStrictDecodingError(err) {
			return nil, fmt.Errorf("failed decoding: %w", err)
		}
		var (
			lenientDecoder = audit.Codecs.UniversalDecoder(apiGroupVersions...)
			lenientErr     error
		)

		// Try strict decoding first. If that fails decode with a lenient
		// decoder, which has only v1beta1 registered, and log a warning.
		// The lenient path is to be dropped when support for v1beta1 is dropped.
		if !runtime.IsStrictDecodingError(err) {
			return nil, fmt.Errorf("failed to decode: %w", err)
		}

		var lenientErr error
		_, lenientCodecs, lenientErr := codec.NewLenientSchemeAndCodecs(
			kubeletconfig.AddToScheme,

			// error was a strict decoding error (e.g. unknown or
			// duplicate fields), we still consider the recognizer
			// to have understood the object
			if out == nil || !runtime.IsStrictDecodingError(err) {
				lastErr = err
				continue
			}
		}
		return out, actual, err
	}

	if lastErr == nil {
		lastErr = fmt.Errorf("no serialization format matched the provided data")
	}

	strictCodec := newCodecFactory(s, newSerializersForScheme(s, testMetaFactory{}, CodecFactoryOptions{Pretty: true, Strict: true})).LegacyCodec()
	_, _, err := strictCodec.Decode([]byte(duplicateKeys), nil, nil)
	if !runtime.IsStrictDecodingError(err) {
		t.Fatalf("StrictDecodingError not returned on object with duplicate keys: %v, type: %v", err, reflect.TypeOf(err))
	}

				}
			}
			loader, err := NewFsLoader(fs, path)
			if err != nil {
				t.Fatalf("unexpected error: %v", err)
			}
			kc, err := loader.Load()

			if c.strictErr && !runtime.IsStrictDecodingError(errors.Unwrap(err)) {
				t.Fatalf("got error: %v, want strict decoding error", err)
			}
			if utiltest.SkipRest(t, c.desc, err, c.err) {
				return
			}
			if !apiequality.Semantic.DeepEqual(c.expect, kc) {

			},
			expectedError: `unknown field "foo"`,
			checkErrFn:    runtime.IsStrictDecodingError,
		},
		{
			name: "duplicate fields",
			options: &Options{
				ConfigFile: duplicateFieldConfig,
				Logs:       logs.NewOptions(),
			},
			expectedError: `key "leaderElect" already set`,
			checkErrFn:    runtime.IsStrictDecodingError,
		},
		{
			name: "high throughput profile",
			options: &Options{

			{
				name:    "Duplicate fields",
				config:  fmt.Sprintf("%s\nbindAddress: 1.2.3.4", yamlTemplate),
				checkFn: kuberuntime.IsStrictDecodingError,
			},
			{
				name:    "Unknown field",
				config:  fmt.Sprintf("%s\nfoo: bar", yamlTemplate),
				checkFn: kuberuntime.IsStrictDecodingError,
			},
		*/
	}

	version := "apiVersion: kubeproxy.config.k8s.io/v1alpha1"
	for _, tc := range testCases {

			expectedObj: &metav1.PartialObjectMetadata{},
			expectedGVK: &schema.GroupVersionKind{Group: "x", Version: "y", Kind: "z"},
			assertOnError: func(t *testing.T, err error) {
				if !runtime.IsStrictDecodingError(err) {
					t.Errorf("expected StrictDecodingError, got: %v", err)
				}
			},
		},
		{
			name:        "no strict mode no strict error",
			data:        []byte{0xa1, 0x61, 'z', 0x01}, // {'z': 1}

			t.Errorf("%d: failed: %v", i, err)
			continue
		case err != nil:
			if !test.errFn(err) {
				logTestCase(t, test)
				t.Errorf("%d: failed: %v", i, err)
			}
			if !runtime.IsStrictDecodingError(err) && obj != nil {
				logTestCase(t, test)
				t.Errorf("%d: should have returned nil object", i)
			}
			continue
		}

		if test.into != nil && test.into != obj {
			logTestCase(t, test)