perf(mojo): vendor Ember/sonic 8-digit SWAR and two-digit itoa - #145
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Re-vendor gld-json #9. Telemetry n=1 deser 2490→1678 ns.
This was referenced Sep 9, 2026
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leo-gan
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Sep 9, 2026
Vendor gld-json one-pass number parse, 4-digit SWAR, Ember ctz SIMD scan, digit-pair itoa, and skip of the short-dtoa exact search. n=1 encode cap is 1024 so list ensure does not resize. Decode lists are pre-sized to n. Official 2026-09-09-160305 vs #145: telemetry n=1 deser 1678→1233 (1.35× Ember), n=100 167450→106745 (1.48×). Telemetry n=1 ser 2020→1319 (1.27×), n=100 195051→117007 (1.53×). Message n=1 deser 406→348 (1.55× Ember). Fidelity 1.0. Version stays 0.2.0.
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Summary
Official all-single vs #144 (median skip warmup):
Fidelity 1.0. Stem
2026-09-09-153729.Validation
test_roundtrip.mojook