[BUG]: kwargs dispatch fails when receiving a non-interned version of a keyword about nanobind HOT 3 CLOSED

It's easy to fix this, but it will come with a cost. Keyword argument dispatch will become slower for everyone. I am not sure if the cost outweighs the benefits.

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This would probably make the code pretty unwieldy, but could keyword argument dispatch first try the address-based check, and then, before giving up on the overload (or, I guess after trying all overloads but before giving up completely), try the slower, equality-based approach?

If that's too much, do you have any other suggested workaround?

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CPython itself (initialize_locals in ceval.c) does the id comparison first, and falls back to contents comparison if there's no match for a given kwarg. That would limit the penalty to functions that take var-keywords and also have some named keywords that aren't provided, which I'm guessing would be more palatable? I can work on a patch.

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