CSV parser always trims only the trailing whitespace of a field, no matter what trimFields is set to

[Kwanddwo]

In add_field, we have the following loop:

while (len > 0 && (start[len-1] == ' ' || start[len-1] == '\t')) {
    len--;
}

This always runs, meaning that the trailing whitespace of all fields is deleted, there is no code in csv_parser.c to trim leading whitespace.

Note: there is the csv_utils_trim_whitespace function in csv_utils.c that handles this