code: @Override
      protected void defaultSort(Comparator<? super E> comparator)
      {
          FastList<E> list = comparator == null
                  ? (FastList<E>) this.toSortedList()
                  : (FastList<E>) this.toSortedList(comparator);
          this.lists.clear();
          this.lists.add(list);
      }
docs: Override in subclasses where it can be optimized.