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@jbrockmendel Ah okay understood!

Looking at the implementation, it looks like the changes for this PR need to be made either in _ensure_nanosecond_dtype() in cast.py, or in the implementation for is_supported_unit() in dtypes.pyi.

Seeing that is_supported_unit() in dtypes.pyi is an interface, I'm assuming that there is a definition for this function for pd.array, but I don't see it. Would you be able to shed some light on how this interface method is being used?