Hello, I just publish the PEP-0604 <https://www.python.org/dev/peps/pep-0604/> for discussions (https://www.python.org/dev/peps/pep-0604/). Because this proposition is between python and typing, and because the discussion has already been made here, I start a new discussion <https://mail.python.org/archives/list/typing-sig@python.org/thread/D5HCB4NT4...> in typing-sig@python.org. Your remarks are welcome. Philippe Prados