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Lookups compare numbers exactly, like Excel

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MATCH, XMATCH, VLOOKUP, HLOOKUP, XLOOKUP and LOOKUP compared numbers at
15 significant digits (through compare / compare_numbers), so a computed
key such as =0.1+0.2 (0.30000000000000004) found 0.3. Excel 365 compares
lookup keys exactly in exact, approximate and binary search modes, while
=, SWITCH and the criteria functions (COUNTIF(S), SUMIF(S), AVERAGEIF,
MAXIFS) keep the 15-digit comparison. Observed in Excel via COM with
synthetic values.

lookup_equal now compares numbers with ==, and the lookup searches order
values with lookup_order (exact for numbers, compare otherwise).
compare_numbers and the criteria path are unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Harrison Booth
2026-10-14 18:26:06 -05:00
co-authored by Claude Opus 5.5
parent d9d09f0baa
commit ab4d58ca6f
5 changed files with 211 additions and 11 deletions
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docs/function-parity.md
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@@ -1,6 +1,6 @@
# Function parity: worksheet functions and formulas
> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-12 · **Change:** minor (USDOLLAR added as a compatibility function; MIRR, COUNTIF and INDIRECT edge cases match Excel 365) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-14 · **Change:** minor (lookups compare numbers exactly, like Excel 365) · **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).
@@ -108,6 +108,7 @@ workbooks; results checked in as data, not Excel files) and fixing what it finds
| Date | Change | Summary |
|---|---|---|
| 2026-10-14 | minor | MATCH, XMATCH, VLOOKUP, HLOOKUP, XLOOKUP and LOOKUP compare numbers exactly in every match and search mode, as Excel 365 does: `MATCH(0.1+0.2,{0.3},0)` is `#N/A` and 0.3 sorts below 0.30000000000000004 in approximate and binary search. `=`, SWITCH and the criteria functions (COUNTIF(S), SUMIF(S), AVERAGEIF(S), MAXIFS…) keep comparing at 15 significant digits, also as observed |
| 2026-10-12 | minor | USDOLLAR added as a Compatibility function (not on Microsoft's list, so the counts don't change); MIRR with no positive flow is -1, COUNTIF's bare `"<="` / `">="` skip empty strings, INDIRECT with `a1` = FALSE gives `#REF!` for A1-style text (#738) |
| 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 | Iterative calculation: circular references iterate up to Maximum Iterations / Maximum Change when enabled |