[Issue 13936] groupBy must be redone

[via Digitalmars-d-bugs]

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

--- Comment #13 from Andrei Alexandrescu <andrei at erdani.com> ---
It goes without saying I read through the comments. Your examples are nice but
are unlikely to yield a bulk of the use cases.

For non-equivalence relations, I think groupByAdjacent is a fine notion and
name (especially since we have findAdjacent already). Would that make sense?

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