value too long for type character varying(25)

Hi, I got this error after I upgraded to 7.2.1
I found the document from the below link.

http://www.postgresql.org/idocs/index.php?datatype-character.html

which say "Prior to PostgreSQL 7.2, strings that were too long were
silently truncated, no error was raised."

does anyone know if there is a option to set it truncate the strings?

Thanks alot.

Frank