Incidentally, "get this specialmethod from the type (with specialcasing for classic classes &c)" is a primitive that PEP 246 needs as much as, say, copy.py needs it. In the light of the recent discussions of how to fix copy.py etc, I'm unsure about what to assume there, in a rewrite of PEP 246: that getattr(obj, '__aspecial__', None) always does the right thing via special descriptors, that I must spell everything out, or, what else...?
I think you can make it a condition that metaclasses with __conform__ or __adapt__ must use a data descriptor like my "metamethod" decorator. Then, there is no metaconfusion since metaconfusion requires a metaclass to exist, and you're requiring that in that case, they must use a descriptor to avoid the problem.
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