On 02/08/2014 04:51 AM, Wang Weijun wrote: > at src/util/profile/prof_get.c#L337. So the opposite of "t" is "nil" instead of "f". Is there a history here? Yeah, in LISP, nil is the empty list, which is the only value which evaluates as false, and t is a boolean true. Did you run into a case where someone expected "f" to work as a boolean false value?