Implement VALUE function

[sequba]

Context

New function: VALUE(text)

• Converts numeric strings: "123" → 123, "-123.45" → -123.45
• Parses percentages: "50%" → 0.5
• Parses currencies: "$123" → 123
• Parses dates/times: "01/13/2026" → 46035, "14:30" → 0.604...
• Supports scientific notation: "1.23E3" → 1230
• Supports parentheses notation for negatives: "(123)" → -123
• Respects locale config (decimal/thousand separators, currency symbols)
• Uses custom parseDateTime function when configured
• Returns appropriate CellValueDetailedType (NUMBER_RAW, NUMBER_DATE, NUMBER_TIME, etc.)

Implemented with the assistance of Claude Opus 4.5 and Cursor IDE

How did you test your changes?

• 45 new unit tests covering all functionality
• Full test suite passes (5338 tests)

Types of changes

• Breaking change (a fix or a feature because of which an existing functionality doesn't work as expected anymore)
• New feature or improvement (a non-breaking change that adds functionality)
• Bug fix (a non-breaking change that fixes an issue)
• Additional language file, or a change to an existing language file (translations)
• Change to the documentation

Related issues:

1. Fixes Function VALUE #1592

Checklist:

• I have reviewed the guidelines about Contributing to HyperFormula and I confirm that my code follows the code style of this project.
• I have signed the Contributor License Agreement.
• My change is compliant with the OpenDocument standard.
• My change is compatible with Microsoft Excel.
• My change is compatible with Google Sheets.
• I described my changes in the CHANGELOG.md file.
• My changes require a documentation update.
• My changes require a migration guide.

[github-actions]

Performance comparison of head (ce3c278) vs base (a1fb600)

                                     testName |   base |   head | change
------------------------------------------------------------------------
                                      Sheet A | 523.97 | 523.47 | -0.10%
                                      Sheet B | 175.78 | 176.97 | +0.68%
                                      Sheet T | 153.09 | 152.95 | -0.09%
                                Column ranges | 519.46 | 516.12 | -0.64%
Sheet A:  change value, add/remove row/column |  15.33 |  16.14 | +5.28%
 Sheet B: change value, add/remove row/column | 147.49 | 150.99 | +2.37%
                   Column ranges - add column | 151.58 | 154.65 | +2.03%
                Column ranges - without batch | 455.17 | 454.96 | -0.05%
                        Column ranges - batch | 123.55 | 123.85 | +0.24%

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.18%. Comparing base (a1fb600) to head (ce3c278).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1605   +/-   ##
========================================
  Coverage    97.18%   97.18%           
========================================
  Files          170      170           
  Lines        14796    14820   +24     
  Branches      3250     3257    +7     
========================================
+ Hits         14379    14403   +24     
  Misses         409      409           
  Partials         8        8           

Files with missing lines	Coverage Δ
src/NumberLiteralHelper.ts	93.75% <100.00%> (ø)
src/i18n/languages/csCZ.ts	100.00% <ø> (ø)
src/i18n/languages/daDK.ts	100.00% <ø> (ø)
src/i18n/languages/deDE.ts	100.00% <ø> (ø)
src/i18n/languages/enGB.ts	100.00% <ø> (ø)
src/i18n/languages/esES.ts	100.00% <ø> (ø)
src/i18n/languages/fiFI.ts	100.00% <ø> (ø)
src/i18n/languages/frFR.ts	100.00% <ø> (ø)
src/i18n/languages/huHU.ts	100.00% <ø> (ø)
src/i18n/languages/itIT.ts	100.00% <ø> (ø)
... and 8 more

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