TST/BUG: integer coercion bool with int on windows

[jreback]

xref #12841

this is a test in test_coercion.py, L361

In [3]: import pandas as pd

In [4]: s = pd.Series([True, False, True, False])

In [5]: s.where(s,1)
Out[5]:
0    1
1    1
2    1
3    1
dtype: int32

on windows the scalar is not coerced to int64 (as it is on other platforms). IIRC .where already has quite complicated logic to do this. How simple is this to fix?

cc @sinhrks

[sinhrks]

Maybe it is caused by NumPy? I don't think everything must be fixed on pandas side, but need to clarify what the current behaviors are.

[jreback]

oh it IS caused by numpy as that defaults to int32 when creating integers on windows. However pandas coerces everything internally to int64. So just need to investigate if this is by a bug in the logic somewhere. Or we can just change the test. I'll take a look.