Config with default of None requires type annotation unnecessarily

[chdsbd]

I think we could add another overload to starlette.config.Config to support typing this following example

from starlette.config import Config

config = Config()
PRIVATE_KEY = config("PRIVATE_KEY", default=None)
reveal_type(PRIVATE_KEY) # Type of "GITHUB_PRIVATE_KEY" is "Any"

An extra overload could correctly type this variable as str | None

Would you accept a PR to fix this?

[Kludex]

hmmm... Isn't the above this case:

starlette/starlette/config.py

Lines 84 to 88 in 25a52fe

	@typing.overload
	def __call__(
	self, key: str, cast: typing.Type[str] = ..., default: T = ...
	) -> typing.Union[T, str]: # pragma: no cover
	...

?

Would you accept a PR to fix this?

But yes...