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> I have no idea what CLOS does in this situation.
No worries, I was just curious whether you knew whether this was a solved problem in Dylan or CLOS or some other language.
When faced with a diamond diagram, what are the semantics for isinstance(super_instance, cls)?
I worked on it for a little bit and came up with the following:
def super_isinstance(super_inst, cls):
 'Is the cls in the mro somewhere after the current class?'
 mro = super_inst.__self__.__class__.__mro__
 thisclass = super_inst.__thisclass__
 return cls in mro and mro.index(thisclass) < mro.index(cls)