> Have array and reference types and primos been updated to be > BoxedRep-polymorphic, or is it still just expensive scaffolding? >
Not at the moment. A few primops have been updated for GHC 9.4 (e.g. pointer equality, keepAlive) , but nothing pertaining to arrays yet (MR !5218 <https://gitlab.haskell.org/ghc/ghc/-/merge_requests/5218>). Cheers, Sam
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