Probably these ones:
https://discuss.python.org/t/pep-467-minor-api-improvements-for-binary-sequences/42001/25
https://discuss.python.org/t/pep-467-minor-api-improvements-for-binary-sequences/42001/26
https://discuss.python.org/t/pep-467-minor-api-improvements-for-binary-sequences/42001/27
https://discuss.python.org/t/pep-467-minor-api-improvements-for-binary-sequences/42001/28
https://discuss.python.org/t/pep-467-minor-api-improvements-for-binary-sequences/42001/32