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Currently uniques are 32-bits wide. 8 of these bits are for the unique class, leaving only 24 for the unique number itself. This seems dangerously small for a large project. Let's use the full range of the native machine word. We also add (now largely unnecessary) overflow check to ensure that the unique number doesn't overflow. Test Plan: Validate Reviewers: simonmar, austin, niteria Reviewed By: niteria Subscribers: mpickering, thomie Differential Revision: https://phabricator.haskell.org/D2844 GHC Trac Issues: #12944
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