[Issue 13179] AA key type TagIndex now requires equality rather than comparison

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13179

--- Comment #12 from hsteoh at quickfur.ath.cx ---
(In reply to Jonathan M Davis from comment #11)
[...]
> And code really shouldn't be calling opEquals or opCmp directly
> except under very rare circumstances. They're for generating overloaded
> operators, not for calling as normal functions.

Nobody is talking about calling opCmp or opEquals directly here. The issue here
is that == does not behave consistently with <, <=, >=, > when the user defines
opCmp (but not opEquals). Either we should *reject* such code (i.e., the user
must always explicitly define opEquals if opCmp is defined), or we should do
the Right Thing, that is, make opEquals the same as opCmp()==0.

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