Currently, math.factorial only supports integers and not floats, whereas the
"mathematical" version supports both integers and floats.
I.e:
```
import math
def better_factorial(n):
return n * math.gamma(n)
print(math.factorial(10) == better_factorial(10))
```
This ends up in `True`, as that's correct.
However, `math.factorial(math.pi)` (for example, or any float)
Ends up in `ValueError: factorial() only accepts integral values`.
unlike `better_factorial(math.pi)` which would end up in 7.188082728976031.
My proposal is to make another function for floats, or even use the same
math.factorial function and check inside it whether the given input is an
integer or a float object.
I would like to hear your review.
Jonathan.
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