@SuppressWarnings({"unchecked", "nullness"})
    Comparator<@Nullable Object> unsafeComparator = (Comparator<@Nullable Object>) comparator;
    return unsafeComparator.compare(a, b);
  }

  final transient Comparator<? super E> comparator;

  ImmutableSortedSet(Comparator<? super E> comparator) {
    this.comparator = comparator;
  }

  /**

    return unsafeComparator.compare(a, b);
  }

  final transient Comparator<? super E> comparator;

  ImmutableSortedSet(Comparator<? super E> comparator) {
    this.comparator = comparator;
  }

  /**
   * Returns the comparator that orders the elements, which is {@link Ordering#natural()} when the

  }

  private static boolean hasSameComparator(Iterable<?> elements, Comparator<?> comparator) {
    if (elements instanceof SortedSet) {
      SortedSet<?> sortedSet = (SortedSet<?>) elements;
      Comparator<?> comparator2 = sortedSet.comparator();
      return (comparator2 == null)
          ? comparator == Ordering.natural()
          : comparator.equals(comparator2);
    }
    return false;
  }