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

I am not sure that raising an error is the best option. We can just convert an 
integer subclass to an exact int using _PyLong_Copy().

I am not sure that converting to an exact int in low-level C API functions is 
the best option. In many cases we use only the content of the resulting object 
ignoring its type (when convert it to the C integer or float, to bytes array, 
to new instance of int subclass). Creating a new exact int is a waste of time.

This is why I withdrawn my patches and this issue is still open.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue17576>
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