[3.13] gh-127750: Fix functools.singledispatchmethod() #130029
Merged
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In this PR we revert the changes from #107148 (but keep the added tests). This addresses
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For 3.14+ there are open PRs to address the same issues without the performance regression, but for 3.13 it seems safer to revert the changes (#127750 (comment))
@serhiy-storchaka @Yhg1s