add instance PrintfArg Ratio

Henning Thielemann lemming at
Fri Feb 7 21:44:14 UTC 2020

On Fri, 7 Feb 2020, Dannyu NDos wrote:

> It just is so convenient.
> instance (Integral a, Show a) => PrintfArg (Ratio a) where

Why should a Printf instance be base on Show? Wouldn't it better to format 
numerator and denominator using printf, too?

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