return new AbstractIterator<E>() {
          final Iterator<? extends E> itr1 = set1.iterator();
          final Iterator<? extends E> itr2 = set2.iterator();

          @Override
          @CheckForNull
          protected E computeNext() {
            if (itr1.hasNext()) {
              return itr1.next();
            }
            while (itr2.hasNext()) {
              E e = itr2.next();

			return true
		}
		refs[k] = false
	}
	return false
}

func TestOwnerRefsChanged(t *testing.T) {
	toRefs := func(strs []string) []metav1.OwnerReference {
		refs := []metav1.OwnerReference{}
		for _, s := range strs {
			pieces := strings.Split(s, "/")
			refs = append(refs, metav1.OwnerReference{
				APIVersion: pieces[0],
				Kind:       pieces[1],
				Name:       pieces[2],
			})