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js-on-sx: high-precision number-to-string via round-trip + digit extraction

- js-big-int-str-loop: extract decimal digits from integer-valued float
- js-find-decimal-k: find min decimal places k where round(n*10^k)/10^k == n
- js-format-decimal-digits: insert decimal point into digit string at position (len-k)
- js-number-to-string: if 6-sig-fig round-trip fails AND n in [1e-6, 1e21),
  use digit extraction for full precision (up to 17 sig figs)
- String(1.0000001)="1.0000001", String(1/3)="0.3333333333333333"
- String test262 subset: 58→62/100

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-04-25 14:42:32 +00:00

1004 B

Raw Blame History

test262 scoreboard

Pinned commit: d5e73fc8d2c663554fb72e2380a8c2bc1a318a33 Wall time: 40.5s

Total: 62/100 runnable passed (62.0%). Raw: pass=62 fail=29 skip=1130 timeout=9 total=1230.

Top failure modes

24x Test262Error (assertion failed)
9x Timeout
1x Unhandled: Not callable: \\
1x ReferenceError (undefined symbol)
1x SyntaxError (parse/unsupported syntax)
1x TypeError: not a function
1x Unhandled: js-transpile-binop: unsupported op: >>>\

Categories (worst pass-rate first, min 10 runnable)

Category	Pass	Fail	Skip	Timeout	Total	Pass %
built-ins/String	62	29	1123	9	1223	62.0%

Per-category top failures (min 10 runnable, worst first)

built-ins/String (62/100 — 62.0%)

24x Test262Error (assertion failed)
9x Timeout
1x Unhandled: Not callable: \\
1x ReferenceError (undefined symbol)
1x SyntaxError (parse/unsupported syntax)

1004 B Raw Blame History