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Herbert Valerio Riedel authored
This also overrides all optional `Foldable` methods (which would otherwise be default-implemented in terms of `foldMap`) with supposedly optimally minimal implementations. While at it, this also removes the redundant `{-# LANGUAGE CPP #-}`. Reviewed By: austin, dfeuer Differential Revision: https://phabricator.haskell.org/D467
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