request: Explicitly-reexport @type_check_only in typing_extensions

[bzoracler]

@typing.type_check_only was not explicitly-reexported from typing_extensions as part of the typing-extensions 4.7.* update:

typeshed/stdlib/typing_extensions.pyi

Line 70 in 860e34e

type_check_only,

As it is public API in typing.pyi with no indication of being deprecated, would there be any issues in re-exporting this symbol? I understand that it's still not available as a runtime object in typing_extensions.py, if that affects anything.

[JelleZijlstra]

I don't think we should claim it's in typing-extensions when it isn't.

And I wouldn't want to add it to typing-extensions before it is in typing in reality.

[bzoracler]

I get the impression from the Python docs that typing.type_check_only will remain a non-runtime object, with no plans to put an existent symbol in typing.py. However, since the symbol is wholly defined in typing.pyi, I assumed that the motivation for re-exporting the other symbols from typing would equally apply to type_check_only, allowing one to use typing_extensions in lieu of typing in all situations.

Not a big issue though, since there's plenty of workarounds. Thanks for the response.