ArraySort provides a stable implementation of merge sort through its sort
method. It should be used instead of Array.sort in cases where the order
of equal elements has to be retained on all targets.
Static methods
staticsort<T>(a:Array<T>, cmp:(T, T) ‑> Int):Void
Sorts Array a according to the comparison function cmp, where
cmp(x,y) returns 0 if x == y, a positive Int if x > y and a
negative Int if x < y.
This operation modifies Array a in place.
This operation is stable: The order of equal elements is preserved.
If a or cmp are null, the result is unspecified.