default MSeq<T> sort(final int start, final int end) {
		return sort(start, end, null);
	}
Sorts this sequence according to the natural order of the elements.

@param start the start index where to start sorting (inclusively)
@param end the end index where to stop sorting (exclusively)
@throws ClassCastException if the sequence contains elements that are not
        <i>mutually comparable</i> using the specified comparator
@return {@code this} sequence
jenetics/src/main/java/io/jenetics/util/MSeq.java