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Herbert Valerio Riedel authored
This completes the `Foldable` class by two important operations which this way can be optimised for the underlying structure more easily. A minor fix for the `containers` submodule was needed to due name clash Addresses #9621 Reviewed By: ekmett, dfeuer, austin Differential Revision: https://phabricator.haskell.org/D250
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