[$] PEP 572 and decision-making in Python

The "PEP 572 mess" was the topic of a 2018 Python Language Summit sessionled by benevolent dictator for life (BDFL) Guido van Rossum. PEP 572 seeks to addassignment expressions (or "inline assignments") to the language, but ithas seen a prolonged discussion over multiple huge threads on the python-dev mailing list-evenafter multiple rounds on python-ideas.Those threads were often contentious and were clearly voluminous to thepoint where many probably just tuned them out.At the summit, Van Rossum gave an overview of thefeature proposal, which he seems inclined toward accepting, but he alsowanted to discuss how to avoid this kind of thread explosion in the future.