Suggestion to introduce a 'Boolean' column type (among Text, Date) which interprets "true" and "1" (unquoted) as =TRUE() and "false" and "0" as =FALSE()
Fwiw, one already gets that for true and false if in the import dialog "Detect special numbers" is activated, which then imports them as 1 and 0 formatted with BOOLEAN to TRUE and FALSE. Columns with numeric values (e.g. 1 or 0) can always be assigned the BOOLEAN number format after import.
I don't know if we would gain much with an explicit Boolean column type, though it might be nice in some circumstances. Note however that forcing to Boolean could hide values other than 0 or 1 because any numeric value other than 0 is formatted to TRUE. Of course the import could not apply the BOOLEAN format for other values to make them stand out, ending up with a column of mixed types again.
If I switch the number format in Format Cells > Numbers > Category to Boolean Value I get the localized forms of true/false.
What's your use case, Maarten?
Hi Heiko, I missed the follow up question. My use case was probably solved by Eike Rathke's suggestion, but it might have required some additional preparation. I still think that 'Detect special numbers' is not a flag I'd expect to have any effect on True/False recognition. Also recognizing 'true' and 'false' as values as TRUE() and FALSE() respectively would be a nice addition (perhaps even with localized versions such as "Yes/No", "Ja/Nee", "Si/Non"... etc.)