Currently the class can inherit from arbitrary objects, not only types.
If the object was not designed for this you can get a mysterious
mistake, e g.:
>>> class A(1): ...
...
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: int() takes at most 2 arguments (3 given)
If the object's constructor is compatible with type constructor by
accident you can an unexpected result. To prevent this we usually add an
explicit __mro_entries__() method which raises an exception.
I propose to make __mro_entries__() mandatory if a base is not a type
instance (with a deprecation period).
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