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niteria authored
Unique order can introduce nondeterminism. As a step towards removing the Ord Unique instance I've refactored the code to use deterministic sets instead. Test Plan: ./validate Reviewers: simonmar, austin, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2369 GHC Trac Issues: #4012
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