[issue47079] Integral.denominator shouldn't return an int

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Raymond and Serhiy, you were the last two active devs to touch numbers.py.

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nosy: +rhettinger, serhiy.storchaka, terry.reedy

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<https://bugs.python.org/issue47079>
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