While experimenting with my InterfaceClass subclass I noticed that it was only being used when it was specified as the first of the bases. I believe this is because InterfaceClass is not a subclass of ``type``, so the normal metaclass derivation logic is not applied. The attached patch implements that logic in InterfaceClass.__new__, picking from the base metaclasses that metaclass which subclasses all other base metaclasses.
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Laurence
metaclass_resolution.diff
Description: Binary data
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