[issue28716] Fractions instantiation revisited

[Eric Wieser]

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

> Are you suggesting that _if_ they were to implement `as_integer_ratio` at some point in the future, then they'd become compatible with `Fraction`

Yes, exactly. Conversely, there's little gain in implementing it _until_ `Fraction` supports calling it.

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<https://bugs.python.org/issue28716>
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