Nick Coghlan added the comment:

Oops, couple of typos:

"... only triggers metaclass resolution at that point ..."

"... if either the metaclass being instantiated is a subclass of all the 
metaclasses of all of the bases ..."

But the only way to bypass the "most derived metaclass" rule is for the the 
metaclass hint to be a callable that creates something that *isn't* a subclass 
of type. If you look at the tracebacks you're getting, you should see that the 
failure *isn't* in the class statement or the outer dynamic type, it's in 
"metaclass_callable", where the *inner* dynamic type creation is failing.


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