Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

> Can 
> https://github.com/python/cpython/commit/fc7df0e664198cb05cafd972f190a18ca422989c
>  be reverted?

Even if subclass() will check explicitly that its first argument is a type, 
ABC.__subclasscheck__() can be called directly, and it shouldn't crash when 
called with non-type.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33018>
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