[Issue 13936] groupBy must be redone

[via Digitalmars-d-bugs]

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

--- Comment #11 from bearophile_hugs at eml.cc ---
(In reply to Andrei Alexandrescu from comment #10)

> 1. I think we shouldn't care about non-equivalence relations. Most tasks
> people do are relational-inspired operations using equivalence relations.
> All APIs I know of only support equivalence relations. It would take a lot
> of evidence to default the other way. For the time being I am explicitly
> opposed to supporting non-relational predicates if that complicates anything
> in any way.

This was discussed in the pull request. I suggest you to take a look at those
discussions. You can't ignore those discussions.

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