[m-dev.] User defined comparison and equality

[Ralph Becket]

If a type has user-defined comparison, are unifications in the
in = in is semidet mode implemented as calls to compare((=))?

Otherwise it seems to me that we can have A \= B but
compare((=), A, B).

The requirement that this not be the case is not listed as a
programmer obligation in the reference manual, so it's not clear
to me what happens.

Cheers,
	Ralph
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