Reading a Rational with zero denominator should fail?

Summary

When reading a String as a Rational number, there seems to be no nice way prevent an error when the rational's denominator is zero.

(read "1%0") :: Rational

I would expect readMaybe to return Nothing when the denominator is zero.

If this seems like a good idea, I would be happy to attempt a patch

Edited Jul 26, 2020 by bwroga

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