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> The reason the difference matters to me is that someone who writes a random or
> otherwise noncommutative method is (definitely) doing it to themselves. But at
> least in previous versions of Lua, the language required basic safeguards by
> requiring that both operands "share the same metamethod".[1]

I think you can say the same now: someone who writes an A.__eq that
says it is equal to B, when B disagrees about that, "is doint it to
themselves". Your objects should only say they are equal to objects
they know about (but, as Dirk pointed out, may need a different method).

-- Roberto