The <<trunc...>> function will truncate the given stringArg to the number of characters of the value given to the required length parameter. By default, the characters are counted from the left most position up to and including the character at the position specified by the length parameter. This includes any white space characters, and also includes the end of line characters of line feed an carriage return, which each count as one.
If the from parameter is given and its value is “left”, the counting begins at the right-most character of the string, truncating the left characters beyond the given length.
If the stringArg is shorter or equal to the length specified, the entire string is returned.