Ivan Levkivskyi <levkivs...@gmail.com> added the comment:

I think we can proceed with option A, but only if doesn't cause visible 
slow-down for creating ABCs (which is already slower that normal classes). TBH, 
I don't want to document A as "official" recipe (maybe however mention the 
problem in the `pickle` module docs).

Note that other "class factories" in stdlib (like collections.namedtuple) do 
almost exactly option A.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue28869>
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