Proposal: Show and Read for Data.Ord.Down

[Krzysztof Gogolewski]

Hello,

I propose to add derived Show and Read instances to Data.Ord.Down. This
should be uncontroversial. Any thoughts?

For reference, Data.Ord.Down is currently defined as

newtype Down a = Down a deriving (Eq)

instance Ord a => Ord (Down a) where
    compare (Down x) (Down y) = y `compare` x

Krzysztof Gogolewski
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