Guards against CSV/formula injection: a string cell whose first character is a formula trigger
(=, +, -, @, tab, CR) is prefixed with a single quote so Excel/Sheets render it as text
rather than evaluating it. Non-string and empty values pass through untouched.
Guards against CSV/formula injection: a string cell whose first character is a formula trigger (
=,+,-,@, tab, CR) is prefixed with a single quote so Excel/Sheets render it as text rather than evaluating it. Non-string and empty values pass through untouched.