public static SortedIntervals <U> Union <T, U>(this SortedIntervals <T> intervals, Func <IEnumerable <T>, U> reduce)
{
return(new SortedIntervals <U>(intervals.UnionEnumerator().Select(g => g.Range(reduce))));
}
public static SortedIntervals <T[]> Union <T>(this SortedIntervals <T> intervals)
{
return(new SortedIntervals <T[]>(intervals.UnionEnumerator().Select(g => g.Range())));
}