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The Zig language allows the compiler to make this optimization automatically. We should definitely make the compiler do that, and revert this commit. However, that will not happen in this branch, and I want to continue to explore achieving performance parity with merge-base. So, this commit changes all InternPool parameters to be passed by const pointer rather than by value. I measured a 1.03x ± 0.03 speedup vs the previous commit compiling the (set of passing) behavior tests. Against merge-base, this commit is 1.17x ± 0.04 slower, which is an improvement from the previous measurement of 1.22x ± 0.02. Related issue: #13510 Related issue: #14129 Related issue: #15688