BUG: Regression #18075 | Fixing Ufunc TD generation order

[ganesh-k13]

RCA:

Reason: TD order of floor divide ufunc got changed. Expected signed before unsigned.
Escape Reason: Testplan gap, Execution gap

Found By:

pandas-dev/pandas#40874

UT Added: Yes

Note: Please let me know if we need to move it somewhere else

cc: @seberg

[ganesh-k13]

Ok so a couple of doubts :) :

1. How did an upcast happen and only for unsigned and particualry to int16 if we put uints after sints?
2. So dispatch is not needed for all the types mentioned for a given TD?

[seberg]

NumPy picks the first loop that "works" right now (that is defined by "safe casting", although I don't like that way of thinking about it much). So bool can cast to anything, so that means the first loop is taken. But (especially for scalars!) the correct order is important. (I am myself now a bit confused why 0-D arrays seem cased ;), but lets not worry about it)

[charris]

Thanks @ganesh-k13 .