Issues

• [Bug]: ISOWEEKNUM returns 53 for late-December dates that belong to week 1 of the next year

  handsontable/hyperformula#1884 · Filter by author trackoor opened on Nov 8, 2026

• [Bug]: FIND returns start_num - 1 instead of #VALUE! when text is not found and start_num > 1

  handsontable/hyperformula#1883 · Filter by author trackoor opened on Nov 8, 2026

• [Bug]: ISOWEEKNUM() returns 53 for late-December days that belong to week 1 of the next year

  handsontable/hyperformula#1882 · Filter by author jayhemnani9910 opened on Nov 8, 2026

• [Bug]: INT() truncates negative numbers instead of rounding them down

  handsontable/hyperformula#1881 · Filter by author jayhemnani9910 opened on Nov 8, 2026

• [Bug]: EDATE and EOMONTH return #NUM! when months is not a whole number

  handsontable/hyperformula#1880 · Filter by author trackoor opened on Nov 7, 2026

• [Bug]: DAYS360 (US method) ignores the end-of-month rule when the start date is the last day of February

  handsontable/hyperformula#1879 · Filter by author trackoor opened on Nov 7, 2026

• [Bug]: An array literal with a large array element throws "Maximum call stack size exceeded"

  Bug
  handsontable/hyperformula#1878 · Filter by author Tobiadefami opened on Nov 5, 2026

• [Bug]: An array literal that starts with a spilled range changes that range's stored values

  Bug
  handsontable/hyperformula#1877 · Filter by author Tobiadefami opened on Nov 5, 2026

• [Bug]: Uncaught "Resizing to smaller array" when the sheet behind a whole-column or whole-row array source grows

  Bug
  handsontable/hyperformula#1825 · Filter by author Tobiadefami opened on Oct 15, 2026
  1

• [Bug]: SUBSTITUTE expands dollar sequences in replacement text

  handsontable/hyperformula#1808 · Filter by author vera-rubin opened on Oct 14, 2026

• [Bug]: Cyrillic function names are rejected by the formula parser

  handsontable/hyperformula#1803 · Filter by author kbulygin opened on Oct 9, 2026

• numberToSimpleDate returns day 0 for 31 December of some years when leapYear1900 is true

  handsontable/hyperformula#1793 · Filter by author marcin-kordas-hoc opened on Oct 6, 2026

• Array formulas in the #SPILL! state don't re-spill when space becomes available

  handsontable/hyperformula#1785 · Filter by author Tobiadefami opened on Oct 2, 2026

• Uncaught "Resizing to smaller array" when a spilling VSTACK/HSTACK/array literal contains an element whose size depends on a cell

  handsontable/hyperformula#1780 · Filter by author marcin-kordas-hoc opened on Sep 29, 2026

• [Bug]: ROUND() skips smart rounding, so a cell that displays 109.5 rounds down to 109

  Bug
  handsontable/hyperformula#1746 · Filter by author budnix opened on Aug 21, 2026

• [Bug]: Array formula spill cells serialize as literal values, so rebuildAndRecalculate() produces #SPILL!

  Bug
  handsontable/hyperformula#1745 · Filter by author budnix opened on Aug 21, 2026

• [Bug]: FORMULATEXT is not recalculated when the referenced cell's formula changes

  handsontable/hyperformula#1744 · Filter by author sl01k opened on Aug 20, 2026

• HyperFormula 3.3.0 is here!

  ANNOUNCEMENT
  Feature

  handsontable/hyperformula#1685 · Filter by author GreenFlux opened on May 27, 2026

• [Bug]: Parser fails on formulas with _xlfn.xxx prefix added by Excel for backwards compatibility

  BugImpact: HighPublicRoadmap
  Bug

  handsontable/hyperformula#1655 · Filter by author GreenFlux opened on Apr 15, 2026
  2

  

• Support for partial infinite ranges (mixed-type ranges) e.g. A2:A

  Feature
  handsontable/hyperformula#1651 · Filter by author oodavid opened on Apr 8, 2026
  4

• Add #CALC! error type for Excel compatibility

  FeatureImpact: LowTo Be Discussed
  Feature

  handsontable/hyperformula#1647 · Filter by author marcin-kordas-hoc opened on Mar 30, 2026

• Array functions: missing max dimension guard causes OOM crash

  APIBugImpact: Medium
  Bug

  handsontable/hyperformula#1646 · Filter by author marcin-kordas-hoc opened on Mar 30, 2026
  2

• [Bug]: ADDRESS returns "!R2C3" when sheetName is empty (should return "R2C3")

  BugImpact: Low
  Bug

  handsontable/hyperformula#1641 · Filter by author marcin-kordas-hoc opened on Mar 20, 2026

• [Bug]: ParserWithCaching cache can grow without limit

  handsontable/hyperformula#1635 · Filter by author sequba opened on Mar 10, 2026
  

• HyperFormula 3.2.0 is here!

  ANNOUNCEMENT
  handsontable/hyperformula#1618 · Filter by author AMBudnik opened on Feb 19, 2026