The following is copied and pasted from https://github.com/python/peps/pull/1650
Stefano Borini ===========
Commit message: PEP 637 I've asked Jonathan Fine to resign as PEP author, and he's agreed to do so. Details in the pull request
Pull request comment: Hi Jonathan
Thank you for accepting my invitation to be a co-author of PEP 637. I regret that because of disagreeing direction for the PEP I think it best for the community that I ask you to resign as co-author.
Thank you for your help ===
Jonathan Fine =========== Hi Stefano
I'm sorry things didn't work out, the way either of us wanted.
Yes, there were disagreements! Particularly on python-ideas, involving also PEP sponsor Steve D'Aprano.
I'd like the PEP to be improved before it is submitted.
with best regards