Ryan McCampbell added the comment: It's not really a particular use case. I was making a function decorator for automatic type checking using annotations (ironically I discovered later there is an almost identical example in the PEP for signatures). But I can't think of any use case when it would be undesirable to include the extra parameters, unless it slows down the code, hence the possibility of a separate method. It would not complicate the API to add behavior that would simplify most applications. And I just realized this is also the behavior of inspect.getcallargs, for which the docs recommend to switch to Signature.bind.
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