maybe_upcast(values: 'NumpyArrayT', fill_value: 'Scalar' = nan, copy: 'bool' = False) -> 'tuple[NumpyArrayT, Scalar]'
The array that we may want to upcast.
If True always make a copy even if no upcast is required.
the original array, possibly upcast
the fill value, possibly upcast
Provide explicit type promotion and coercion.
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