What will happen with complex input?

@mattip this only promotes integer inputs (Python scalar integer, actually), so the rest would stay the same?

Thanks a for looking at this, this is very cool to see this use!

I am curious if we can push this further and actually use the promoter always. That is, we:

• Set the first and last dtype to PyArray_CommonDType(first_dtype, AbstractFloatDType):
  • If the last was forced, we just set the first to that instead.
  • Yes, we ignore the second (integer) argument here considering how it is currently defined.
• Set the second dtype to PyArray_CommonDType(second_dtype, int_dtype). That just seems like it always works in practice, so I don't really feel a need to do something more complicated.