[issue38979] ContextVar[str] should return ContextVar class, not None

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:

I think it should look like the corresponding function from multidict: https://github.com/aio-libs/multidict/blob/master/multidict/_multidict.c#L803-L808

Please note, the method definition also should be updated, see https://github.com/aio-libs/multidict/blob/master/multidict/_multidict.c#L923-L928 for inspiration.

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