[issue43198] One operation on sets < 1/100th as efficient in 3.9 than before

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


----------
title: Operations on sets more than hundred times less efficient with python3.9 than with previous versions -> One operation on sets < 1/100th as efficient in 3.9 than before

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43198>
_______________________________________