[docs] [issue25735] math.factorial doc should mention integer return type

[Mark Dickinson]

Mark Dickinson added the comment:

[Terry]

>>> factorial(decimal.Decimal(5.2))
120

Yep, that's definitely wrong. If we want to behave the same way as for float, we should accept only integral Decimal values. (Though I'm not much of a fan of the float behaviour: I would have preferred math.factorial not to accept floats at all.)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25735>
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