[issue17936] O(n**2) behaviour when adding/removing classes

[Kristján Valur Jónsson]

Kristján Valur Jónsson added the comment:

So, any objections?  It is pretty straighforward.  Btw, the searching for Py_NONE seems to be a rudiment of some older version, there is no place where a Py_NONE is put in there.

Also, what is the policy for 2.7?  Are performance bugs proper bugs?

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