Guido van Rossum <gu...@python.org> added the comment:

Yes, it is too late for 3.10 (but you can add it to typing_extensions). Also, 
PEP 585 is done, we don't update PEPs. Please do test with `from __future__ 
import annotations` -- you never know.

When this was first proposed (https://github.com/python/typing/issues/985) 
there were worries about backwards compatibility. Given how common property is, 
we need to make sure there are no problems with that. Can you address that? I 
don't see it in the original thread.

Also, since this requires type checkers to change, do we need a PEP?

Finally. Please keep discussion in this bpo issue, don't have long discussions 
on the PR. (Honestly I think it's too soon for a PR given that we don't seem to 
have agreement in the typing tracker discussion.)

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