[swift-evolution] Proposal: A standard library Fraction type

[T.J. Usiyan]

We seem to have become distracted with the whole Time Signature thing. Time
signatures themselves are not Rationals. I should have said "Metrical Time"
and left it at that. My point has always been that metrical time calls for
the use of Rationals.
TJ

On Mon, Dec 7, 2015 at 9:20 PM, Matthew Johnson <matthew at anandabits.com>
wrote:

>
> > If your implementation of Rational simplifies immediately, sure. Mine
> doesn't and it is useful in many other cases not to as well. You might, for
> example, want to present the original numerator/denominator provided by the
> user.
>
> How does your implementation implement equality?  From a numeric
> standpoint I think most people would consider 3/4 to be equal to 6/8
> whereas this would not be correct for a time signature.
>
> In any case, I agree that a rational type would be a useful addition to
> the library.  I don't think I would use it to model time signatures but
> there are plenty of other uses.
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