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 <rep...@bugs.python.org>
<http://bugs.python.org/issue25735>
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