} catch (ClassCastException e) {
      return -1;
    }
    return (position >= 0) ? position : -1;
  }

  @Override
  ImmutableList<E> createAsList() {
    return (size() <= 1) ? elements : new ImmutableSortedAsList<E>(this, elements);
  }

  @Override
  ImmutableSortedSet<E> createDescendingSet() {
    Comparator<? super E> reversedOrder = Collections.reverseOrder(comparator);
    return isEmpty()