Since 3.9 beta 1 has now been released without this, I think our best bet is to add this to typing_extensions (which has no embargo like that) and strive to add it to typing.py in 3.10. Pull Requests for both of these (as well as for typeshed) will be most welcome.

We also need an implementation in mypy (which may be harder to contribute, since it would require updating some tricky mypy internals).

On Fri, May 22, 2020 at 8:38 AM Mikhail Golubev via Typing-sig <typing-sig@python.org> wrote:

Thanks, I also assumed that it was a helper with a clashing name. But was its removal a deliberate step towards actually adding TypeAlias "back" to typing in its new role anytime soon?
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