code: public void sort(
  		final int from,
  		final int until,
  		final Comparator<? super T> comparator
  	) {
  		_store.sort(from + _start, until + _start, comparator);
  	}
docs: Sort the store.
  
  @param from the start index where to start sorting (inclusively)
  @param until the end index where to stop sorting (exclusively)
  @param comparator the {@code Comparator} used to compare sequence
  elements. A {@code null} value indicates that the elements'
  Comparable natural ordering should be used