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This was referenced Sep 9, 2026
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Content beginning with formula prefixes can be interpreted by spreadsheet applications when CSV/Excel exports are opened. Prefix dangerous CSV string values with an apostrophe and explicitly write Excel strings as text cells, while retaining actual numeric values.
This PR only changes formula handling. It does not include the concurrent file transaction or column mapping changes. The CSV helper is applied directly to the original async writer so this branch is independently based on upstream main.
Validation: all 12 new tests fail before the fix. This isolated branch passes all 108 tests (Python 3.11, Windows with PYTHONUTF8=1). Seven CSV prefixes and five Excel sheet types are tested; saved workbooks are reopened to verify string/numeric cell types. No external formula is executed.
CSV raw values include the protective apostrophe; use JSON/JSONL when exact raw strings are required. Existing files are not repaired, and removing the escaping invalidates the protection. See docs/spreadsheet-formulas.md.
Fork tracking and CI: PR #21. Related report: saksim#5.