[Issue 13936] groupBy must be redone

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13936

--- Comment #20 from Andrei Alexandrescu <andrei at erdani.com> ---
(In reply to Dicebot from comment #18)
> Some quick notes from a very quick look:
> 
> > I think we shouldn't care about non-equivalence relations
> 
> This is something I simply can't accept. groupBy is not a specialized linear
> algebra thing - it is a quite common utility that will be widely used and
> widely misused.

groupByAdjacent should take care of that.

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