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Previously, the `tyConUnique` record selector would unfold into a huge case expression that would be inlined in all call sites, such as the `INLINE`-annotated `coreView`, see #18026. `constraintKindTyConKey` only occurs as the `Unique` of an `AlgTyCon` anyway, so we can make the code a lot more compact, but have to move it to GHC.Core.TyCon. Metric Decrease: T12150 T12234
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