Improving performance of mutable arrays using linear types

I said that Ur where still there in 9.4 (although that my writing was a bit confusing, I must admit).
They are effectively unboxed starting from GHC 9.8, see here: Add Quicksort benchmark and export benchmark results as an artifact by tbagrel1 · Pull Request #477 · tweag/linear-base · GitHub

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Ah, I see. Thanks!