[issue28716] Fractions instantiation revisited

[Eric Wieser]

Eric Wieser <wieser.eric+pybug at gmail.com> added the comment:

> allows Fraction instantiation from duck-typing classes that provide as_integer_ratio

This would allow the numpy `np.floating` types to take part in `Fraction` conversion as well, which would be great.

As far as I can tell, `Decimal` already follows this duck-typing, so it would be a shame for other modules not to.

Perhaps an `num, den = operator.rational(x)` is needed to unify this code across the places that coerce rational numbers.

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nosy: +Eric.Wieser

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue28716>
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