[Haskell-cafe] Proposal: Rational read

[Sean Leather]

Hi Tom,

On Sun, Aug 14, 2016 at 9:48 PM, Tom wrote:

> Is there a reason to not allow '.' as a separator for Rational's Read
> instance, so that both "1%2" and "0.5" can be read?
>

While it would make read :: String -> Rational more convenient, I'm not
sure it would be a good idea to have read accept input that will never be
produced by show :: Rational -> String.

As an alternative, you can use readFloat [1] in Numeric.

Regards,
Sean

[1]
https://hackage.haskell.org/package/base-4.9.0.0/docs/Numeric.html#v:readFloat
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