// callers and stop them from passing unflattened lists
		// TODO chase the caller that is setting this and remove it.
		if _, ok := obj.(*unstructured.UnstructuredList); !ok {
			return fmt.Errorf("list types are not supported by name printing: %T", obj)
		}

		items, err := meta.ExtractList(obj)
		if err != nil {
			return err
		}
		for _, obj := range items {

// i.e. that it does not mutate the object being encoded.
func TestCodecOfUnstructuredList(t *testing.T) {
	var wg sync.WaitGroup
	concurrency := 10
	list := UnstructuredList{
		Object: map[string]interface{}{},
	}
	wg.Add(concurrency)
	for i := 0; i < concurrency; i++ {
		go func() {
			defer wg.Done()
			assert.NoError(t, UnstructuredJSONScheme.Encode(&list, ioutil.Discard))

	for i := range list {
		if e, a := list[i], pl.Items[i]; e != a {
			t.Fatalf("%d: unmatched: %s", i, cmp.Diff(e, a))
		}
	}
}

func TestSetListToMatchingType(t *testing.T) {
	pl := &unstructured.UnstructuredList{}
	list := []runtime.Object{
		&unstructured.Unstructured{Object: map[string]interface{}{"foo": 1}},
		&unstructured.Unstructured{Object: map[string]interface{}{"foo": 2}},

		// because the top-level type matches our desired destination type. actually send the object to the converter
		// to give it a chance to convert the list items if needed.
		if _, ok := obj.(*unstructured.UnstructuredList); !ok {
			// avoid conversion roundtrip if GVK is the right one already or is empty (yes, this is a hack, but the old behaviour we rely on in kubectl)
			objGVK := obj.GetObjectKind().GroupVersionKind()