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

[Terry J. Reedy]

Terry J. Reedy added the comment:

I agree.  In testing, I discovered this bug
>>> factorial(decimal.Decimal(5.2))
120
I don't know if this is a glitch in factorial or Decimal.

I also noticed
>>> fac(fractions.Fraction(4, 1))
Traceback (most recent call last):
  File "<pyshell#10>", line 1, in <module>
    fac(fractions.Fraction(4, 1))
TypeError: an integer is required (got type Fraction)
Perhaps this is due to no __int__ method.

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nosy: +facundobatista, mark.dickinson, rhettinger, skrah, terry.reedy

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