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The built-in isinstance function is still broken when
used on extension classes. For example:
>>> from ExtensionClass import Base
>>> class Super:
... pass
... 
>>> isinstance(Super(), Base)
Traceback (most recent call last):
 File "<stdin>", line 1, in ?
TypeError: isinstance() arg 2 must be a class or type
isinstance() should allow any object as the first
argument and a class, a type, or something with a
__bases__ tuple attribute for the second argument.

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I apologize. Somehow I thought this was a bugh report rather
than a patch, and put off looking at it. When I found the
patch, it was out of date. Can you rework the patch? You
might as well check it in as long as the test suite still
works, so we get this in time for 2.2b1.

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Checked in as abstract.c 2.85.