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Support decimal output for rational #859

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newhoggy
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@newhoggy newhoggy commented Jul 31, 2021

The FromJSON instance is already capable of handling the decimal representation. This change supports outputting the decimal representation when that is more compact.

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λ> toJSON (1 % 10)
Number 0.1
λ> toJSON (1 % 3)
Object (fromList [("denominator",Number 3.0),("numerator",Number 1.0)])

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LGTM.

https://hackage.haskell.org/package/scientific-0.3.7.0/docs/Data-Scientific.html#v:fromRationalRepetend

I agree that matching on Right (s, Nothing) looks like the right choice.

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Thanks!

I think I need some convincing for this. It is a breaking change for anyone using this instance. The reason to only adapt FromJSON may have been because we do not consider that breaking.

I would lean towards having this in a newtype.

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What would you choose as the name of the newtype?

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