add instance PrintfArg Ratio

[Andreas Abel]

The libraries at haskell.org mailing list is not a forum to develop and 
debug haskell functions.  Please refrain from further updates on your 
development process.

Once the proposal is mature and secured by a testsuite it makes sense to 
subject it again to discussion on this mailing list.

Thanks,
Andreas

On 2020-02-09 11:20, Dannyu NDos wrote:
> Also goF is no longer needed.
> 
> 2020년 2월 9일 (일) 오후 7:19, Dannyu NDos <ndospark320 at gmail.com 
> <mailto:ndospark320 at gmail.com>>님이 작성:
> 
>     Bugfix: use round instead of truncate.
> 
> 
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