[issue22676] _pickle's whichmodule() is slow

[STINNER Victor]

STINNER Victor added the comment:

> For example we can take numpy where some ufuncs (i.e. function-like objects implemented in C) don't have a __module__.

Oh. I was not aware of that. Is there a way to fix numpy to set the __module__ attribute? Maybe we should warn users that serialiaing objects without __module__ is much slower?

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<http://bugs.python.org/issue22676>
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