uint64 converted to float when dividing by python integer #13057

I totally get why it is a cause for concern when adding to an int, but I feel like floor division by a positive should be expected to return an integer "safe".

Reproducing code example:

import numpy as np
np.uint64(0) // 4 

Out[2]: -0.0

I guess since I need to divide by 4 I'll just bitshift, but this was kinda unexpected for me.

Numpy/Python version information:

In [3]: import sys, numpy; print(numpy.__version__, sys.version)                                                                                      
1.16.1 3.7.2 (default, Dec 29 2018, 06:19:36) 
[GCC 7.3.0]

installed through conda / conda-forge

xref: #5745