Integration: track t07

# Conflicts:
#	crates/calc/src/tests.rs
#	docs/function-parity.md

docs/function-parity.md

@@ -1,6 +1,6 @@
 # Function parity: worksheet functions and formulas
 
-> **Last reviewed:** 2026-10-15 · **Last updated:** 2026-10-19 · **Change:** minor (ADDRESS quotes sheet names like Excel (#1458); MEDIAN and AGGREGATE median avoid intermediate overflow) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
+> **Last reviewed:** 2026-10-15 · **Last updated:** 2026-10-21 · **Change:** minor (SUBTOTAL and AGGREGATE cap the cells they visit, #2175) · **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).
@@ -55,6 +55,11 @@ By the Excel version that introduced them (working / total): before 2010 346 / 3
 Dynamic-array and LAMBDA-era functions (FILTER, SORT, UNIQUE, XLOOKUP, VSTACK, TAKE, GROUPBY,
 PIVOTBY, REGEXTEST…) are all present.
 
+FORECAST.ETS missing-point interpolation walks known points once, so filling a long gap takes
+linear work in the completed timeline length (#1042). Interpolation values, nearest-value
+endpoint handling, zero-fill mode and the existing 30% missing-point limit are unchanged.
+This improves series preparation; it does not change the model-fitting or seasonality algorithms.
+
 ### Scope of what's missing
 
 | Function(s) | In scope? | Estimate | Note |
@@ -77,6 +82,7 @@ PIVOTBY, REGEXTEST…) are all present.
 | Defined names (workbook and sheet scope), Create from Selection | done |
 | Dynamic arrays, spill, `#SPILL!`, spill operator `A1#` | done; stale-spill bugs (#133, #139; PRs #148, #157) |
 | Recalculation after clearing large sparse ranges | every stored cell changed by Clear is reported to recalculation, without a million-coordinate cutoff; removed formula spills are cleared, and removing empty merges still unblocks spills (#1032) |
+| SUBTOTAL / AGGREGATE input size | references trim to the used range; all areas, arrays and values of one call are charged against the 16-million-cell limit before any cell is read (skipped hidden, nested and error cells count), and `#NUM!` past it (#2175) |
 | Implicit intersection `@`, legacy CSE array formulas | done; legacy array range fill (PR #156) |
 | Trim references `A1:.E10` (trailing), `A1.:E10` (leading), `A1.:.E10` (both), also on whole rows/columns (`A:.A`) | done; evaluated as `TRIMRANGE(range, code, code)`, adjusted on insert/delete; files store `_xlfn.TRIMRANGE(range,code,code)` (Excel's own file spelling unconfirmed in public docs), `_xlfn._TRO_ALL/_TRO_LEADING/_TRO_TRAILING(...)` read too |
 | LET, LAMBDA, named LAMBDAs, ISOMITTED, MAP/REDUCE/SCAN/BYROW/BYCOL/MAKEARRAY | done |
@@ -115,8 +121,10 @@ workbooks; results checked in as data, not Excel files) and fixing what it finds
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-21 | minor | SUBTOTAL and AGGREGATE charge every argument against the evaluator's 16-million-cell limit before scanning; a value in XFD1048576 no longer makes `SUBTOTAL(9,A:XFD)` read the whole sheet (#2175) |
 | 2026-10-19 | minor | LET and LAMBDA names compare case-insensitively in any script, as in Excel: `=LET(dług,100,DŁUG*2)` is 200 (was #NAME?); also LET-bound lambdas called or passed by name (`żar(2)`, `MAP(…,Λ)`), `ISOMITTED`, and formula-bar alias translation (one shared `gridcraft_formula::same_name`, which matches `ß` with `ẞ` and keeps dotless `ı` apart from `i`) |
 | 2026-10-19 | minor | Long flat operator chains (#916): 4,096 operands (Excel's 8,192-character limit) no longer overflow the stack when entered, filled, adjusted or saved; chains past 64 operands are no longer saved as dynamic-array formulas; Spanish entry no longer refuses chains past 256 operands |
+| 2026-10-16 | minor | FORECAST.ETS gap interpolation uses a forward-only known-point scan instead of rescanning each gap for every missing value; numerical behavior and missing-point limits are preserved (#1042) |
 | 2026-10-15 | minor | MEDIAN and AGGREGATE median use an overflow-safe midpoint (#1579); regressions cover finite extremes, tiny values and dependent recalculation |
 | 2026-10-15 | minor | ADDRESS quotes a sheet name the way Excel does: names that read as an A1 cell (`A1`) or an R1C1 reference (`R1C1`, `RC`) and names starting with `.` get quotes; `TRUE` / `FALSE` stay bare (#1458) |
 | 2026-10-13 | minor | Clear reports changed stored cells sparsely, including those beyond the first million coordinates; dependent formulas and removed spills update, while clearing empty merges still unblocks spills (#1032) |