The typing_extensions module is now developed in its own repo, https://github.com/python/typing_extensions. Previously, it was part of https://github.com/python/typing, but that repo is used for several different purposes and typing_extensions stood out as unlike the others. Please watch the new repo if you're interested in typing_extensions development.

The typing repo still hosts the https://github.com/python/typing/discussions forum, the https://typing.readthedocs.io/en/latest/, and issues proposing bigger changes to the type system.