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Namely `Num`, `Functor`, `Applicative`, `Monad`, `Semigroup` and `Monoid` for `Data.Ord.Down` (#13097). Reviewers: austin, hvr, bgamari, RyanGlScott Reviewed By: bgamari, RyanGlScott Subscribers: RyanGlScott, rwbarton, thomie GHC Trac Issues: #13097 Differential Revision: https://phabricator.haskell.org/D3500
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