I'm ready to pronounce PEP 604 as accepted: https://www.python.org/dev/peps/pep-0604/

With the help of Maggie Moss the PEP has received some updates clarifying the specification; Maggie's implementation is also well under way.

Unless there are objections here within the next 24 hours I will accept the PEP, and the feature will launch in Python 3.10.

Thanks Philippe Prados for bringing this to PEP level and thanks to Maggie for her implementation work.