Why suggest adding new round-like functions to the math module rather than defining a new round method on all numerical objects?
>>> round("")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: type str doesn't define __round__ method
It seems it is done like that already ;)
This seems like a problem for the proposal, though: we can't have it in the math library if it's a method!