[issue28866] Type cache is not correctly invalidated on a class defining mro()

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

#38541 reports a severe attribute access slowdown in 3.7.4 in some situations.  (Fixed by the enhancement in #36922, which I presume cannot be backported.)

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nosy: +terry.reedy

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<https://bugs.python.org/issue28866>
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