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

I suppose it is a very old code written when str was a function, not a type 
(thus using type('')) and builtin types were not subclassable (thus not using 
isinstance()).

I once analyzed other similar cases in the stdlib. Seems it is time to revive 
my old patch.

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue44711>
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