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Every string in `values` went through typed input, which reads it with en-US
rules, and nothing said so:
"05.04.2026" (dd.mm.yyyy) → the date 4 May 2026
"02/11/2026" (dd/mm/yyyy) → the date 11 February 2026
"2.500" (thousands) → the number 2.5
"4.25 %" (text) → 0.0425, formatted 0.00%
A workbook built from Turkish-format exports therefore held different values
than the script put in it, and the only way to notice was to read the saved
file back cell by cell.
`parse: false` stores every string as the text it is. A formula is still a
formula — `=` means a formula in a cell, and the ticket asks for that — and
numbers, booleans and null are unaffected either way. A leading apostrophe is
part of the text rather than the marker that makes it text, since nothing is
being marked.
The default is unchanged: `parse` is absent in every existing call, and those
calls behave exactly as before. A `parse` that is neither true nor false is a
usage error rather than a quiet default.
The test pins both sides — the swapped date, the decimal point and the
percentage under today's default; each of the six strings stored verbatim with
`parse: false`, with `=1+1` still calculating 2; numbers and booleans either
way; and the refused `parse` values. Without the change the first string comes
back as a date.