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perf: improve non-SIMD with wordwise validation (#123)
A 1st pass at improving non-SIMD perf. On aarch64/M1 we observe a ~5x asymptotic improvement in uri parsing and ~2.5x in header names & values. We also observe a -40% time reduction in the `req/req` bench. I briefly benched it on x86_64, we see a -20% time reduction in the `req/req` bench there for non-SIMD, needs more testing on x86_64 and possibly only enable these fastpaths if SIMD is off
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