[Issue 13936] groupBy must be redone

[via Digitalmars-d-bugs]

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

--- Comment #21 from Dicebot <public at dicebot.lv> ---
And it is not good exactly for a reason mentioned above - seeing function named
groupBy one would never keep looking for something named like groupByAdjacent.
Resulting in broken app and frustration.

Going other way around is as trivial as mentioning "use this flag for pure
equivalence relation" in docs as those who know linear algebra will immediately
recognize it (and even of they don't, program will still be correct, just
slower)

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