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As commented on the BPO issue: the problem described in this issue is fixed, by BPO-32227.
The wrapper returned by the @register decorator is calling dispatch() with the first argument's __class__. It can only ever be invalid if somebody deliberately wrote something invalid to the object's __class__. It's extremely unlikely.
We should not slow down calling of all generic functions on the basis that somebody might pass a non-type straight to dispatch().
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https://bugs.python.org/issue27984