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The value is passed to PyArg_ParseTuple with the d format. Based on the documentation, my understanding was that this required a float object, not a SupportsFloat object. However, testing with Python 3.11, it seems that a SupportsFloat object is actually accepted, so I'll revert this part of the change.

(Testing with SupportsInt I do get the expected TypeError, so at least that part matches the documentation.)