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Glasgow Haskell Compiler / GHC
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Matthew Craven
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Closes #20532. This implements CLC proposal 104: https://github.com/haskell/core-libraries-committee/issues/104 The design is explained in Note [DataToTag overview] in GHC.Tc.Instance.Class. This replaces the existing `dataToTag#` primop. These metric changes are not "real"; they represent Unique-related flukes triggering on a different set of jobs than they did previously. See also #19414. Metric Decrease: T13386 T8095 Metric Increase: T13386 T8095 Co-authored-by:Simon Peyton Jones <simon.peytonjones@gmail.com>