Barry A. Warsaw added the comment:

So yeah, I guess Cython is doing something magical to boost the instance's 
type's basicsize, but I can't tell what from the Python prompt.  It also 
clearly doesn't affect the un/picklability of the instance, so I think the 
entire check is probably misguided.

It should almost definitely not raise a TypeError.  Either disable the entire 
check, or at most make it a warning.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22995>
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