In Python 3, floor and ceil changed to return integers, rather than floats:

>>> math.floor(1.5), math.ceil(1.5)
(1, 2)
>>> np.floor(1.5), np.ceil(1.5)
(1.0, 2.0)   # also the output for the first case on 2.7

Should we update these function in numpy to also return integer types?

I think the deprecation path would be

• add f->i loops to the ufunc, so that np.floor(1.5, dtype=int) is possible
• on python 3, start FutureWarning on np.floor(1.5) with no dtype
• on python 3, switch the default dtype to int