moonbitlang / core / 4542

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perf(json): NaN sentinel for try_fast_double

JsonNumberScan::try_fast_double returned Double? — Some(d) on the fast path,
None to fall back to strconv. The fast path can only produce 0 or a finite
Double (the checked_mul guard rules out infinity), so NaN is a free sentinel.
Returning a plain Double (NaN meaning "not handled") skips the boxed
Option<Double> allocation on every JSON number that hits this path.

Split out of the original combined PR per review feedback (2/3).

https://claude.ai/code/session_017MVaMFPQYuvxLCudMEsQr2

14 of 16 new or added lines in 1 file covered. (87.5%)

14920 of 15874 relevant lines covered (93.99%)

207043.15 hits per line