if (comparator != null) {
      checkArgument((extraCharacteristics & Spliterator.SORTED) != 0);
    }
    final class WithCharacteristics implements Spliterator<T> {
      private final Spliterator.OfInt delegate;

      WithCharacteristics(Spliterator.OfInt delegate) {
        this.delegate = delegate;
      }

      @Override
      public boolean tryAdvance(Consumer<? super T> action) {