* {@code comparator.compare(x, y) == 0}) removed. To produce an {@code ImmutableSortedSet} sorted
   * by its natural ordering, use {@code toSortedSet(Ordering.natural())}.
   *
   * <p><b>{@code Stream} equivalent:</b> {@code ImmutableSortedSet.copyOf(comparator,
   * stream.iterator())}, or pass {@link ImmutableSortedSet#toImmutableSortedSet} to {@code

   * {@code comparator.compare(x, y) == 0}) removed. To produce an {@code ImmutableSortedSet} sorted
   * by its natural ordering, use {@code toSortedSet(Ordering.natural())}.
   *
   * <p><b>{@code Stream} equivalent:</b> pass {@link ImmutableSortedSet#toImmutableSortedSet} to
   * {@code stream.collect()}.
   *