Ivan Levkivskyi added the comment:

> Are typing.ChainMap and others actually abstract classes?

They are abstract classes in the sense that they are instances of abc.ABCMeta. 
However, for some reasons inspect checks __flags__ attribute. The latter 
probably reflects the fact that Deque etc. do not have abstract methods (they 
still need to be instances of abc.ABCMeta because they need to be generic).

I don't think that we need to change behaviour of inspect because it could be 
backward incompatible. I would either make changes to refleak or typing (adding 
few more cleanups in either place).

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29638>
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