Mike Swanson acee9be6d9 dataforth(datasheet): Fix 2 — emulate QB single-precision rounding (26 -> 9 dirty) ...

formatMeasuredExact now applies Math.fround to the parsed value before toFixed.
The DOS QuickBASIC computed/stored these as single-precision floats, so the
last-digit rounding at the .5 boundary follows single, not double, precision.
Without it, double-precision toFixed flipped boundaries (9.9995 -> "9.999" vs
golden "10.000"; 46.85 -> "46.9" vs "46.8"; .45 -> "0.5" vs "0.4"; 3.3325 ->
"3.333" vs "3.332"). Verified each against the staged golden.

STAGE 3 re-validation: FINAL-TEST CLEAN models 68 -> 85 (+17), mismatches
26 -> 9, cert matches 2123 -> 2206. Zero regression — every remaining dirty
model was already dirty pre-fix; no previously-clean model flipped.

The 9 remaining are NOT rounding:
- 4 models (DSCA38-05/-1793/-19C/-19E): Supply Current retest data-vintage — the
  staged .TXT is an older test run than the DB latest-wins record; not a render
  bug, can't reconcile against an older sheet.
- 5 models (DSCA39-01/02/05/07/1950): STAGE 1 template artifact — the footer note
  "Standard output load for test is 250 ohms." was mis-captured as a truncated
  parameter row. A renderer-side fix was attempted but emitted the note for all
  current-output models (regressed 24 clean -C models), so it was reverted; needs
  a targeted STAGE 1 extractor fix instead.

Renamed dsca-clean68-models.json -> dsca-clean-models.json (now 85 models).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-06-18 13:02:34 -07:00

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