giles 00edae49e4 js-on-sx: hex-literal string→number coercion (+15 Number) ...

ES spec: ToNumber("0x0") == 0, ToNumber("0xFF") == 255. Our parser
returned NaN for anything with a 0x/0X prefix, failing S9.3.1_A16..A32
(every hex-literal assertion test case).

Added:
- js-hex-prefix?      — is this an 0x/0X prefix?
- js-is-hex-body?     — all remaining chars are [0-9a-fA-F]?
- js-parse-hex        — walk chars, accumulate in base 16, NaN on bad char
- js-hex-digit-value  — char → 0..15 (or -1)

js-is-numeric-string? short-circuits to the hex-body check on 0x*
prefix; js-num-from-string dispatches to js-parse-hex on same.

Unit 521/522, slice 148/148 unchanged.
Number scoreboard: 58/100 → 73/100 (+15).

Sample flipped: S9.3.1_A16 (0x0/0X0), A17..A31 (0x0..0xF and 0x10..0x1F
range coverage). Many of the remaining 22 fails are (new Number()).x
style prototype-chain introspection and MAX_VALUE precision.

2026-04-24 12:14:47 +00:00

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