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Numfmt: fraction literals and zero fractions, ? pads thousands separator, TEXT booleans through text section

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Checked against Excel-cached TEXT() results in number- and text-format test workbooks: 226 of 352 TEXT cells mismatched before, 0 after.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
neilcawse
2026-10-11 16:39:30 -04:00
co-authored by Claude Opus 5.5
parent 4dca02c89b
commit 737999f182
5 changed files with 206 additions and 47 deletions
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docs/function-parity.md
+8 -1
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@@ -1,6 +1,6 @@
# Function parity: worksheet functions and formulas
> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-11 · **Change:** minor (ODDFPRICE, ODDFYIELD, ODDLPRICE, ODDLYIELD added) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-11 · **Change:** minor (TEXT and number formats: fraction literals, `?` thousands padding, booleans through the text section) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
Excel's worksheet functions, category by category, against GridCraft's function library. Part of
[target-app-parity.md](target-app-parity.md); gaps feed [gaps.md](gaps.md).
@@ -95,6 +95,12 @@ reports keep finding edge cases: MIN() with no arguments (#138), COUNTBLANK past
10-09). Statistical distributions and financial functions with iterative solvers (RATE, IRR,
XIRR, YIELD) are the highest-risk for last-digit differences.
TEXT() and cell display share `crates/numfmt`; checked against Excel-cached results in
number- and text-format test workbooks (352 TEXT cells), all match:
fraction sections with literal text (`#\:#=/=#`, `#_#/#`), zero fractions, zero-padded
denominators, `?` placeholders padding the thousands separator, and booleans through the text
section (`TEXT(TRUE,";;;\@@\@")` = `@TRUE@`).
Work to close (16–26 h in total): the in-scope missing functions (10–16 h with the table above),
an oracle corpus of Excel-computed results per function (owner runs Excel on generated
workbooks; results checked in as data, not Excel files) and fixing what it finds (6–10 h).
@@ -103,6 +109,7 @@ workbooks; results checked in as data, not Excel files) and fixing what it finds
| Date | Change | Summary |
|---|---|---|
| 2026-10-11 | minor | TEXT / number formats fixed against Excel-cached results: fraction literals and zero fractions, `0` denominators zero padded, `?` pads the thousands separator, booleans use the text section (226 mismatches → 0 in 352 TEXT cells) |
| 2026-10-11 | minor | ODDFPRICE, ODDFYIELD, ODDLPRICE, ODDLYIELD added: Financial 55 / 55; 505 / 523 by name, 496 working |
| 2026-10-11 | minor | PERCENTOF and EUROCONVERT added: 503 / 523 by name, 494 working |
| 2026-10-11 | minor | BAHTTEXT added: 502 / 523 by name, 493 working |