Changes for version 3.41
- (libev) fix many heap-related bugs (timers, periodics).
- (libev) improve timing stability of timers and periodics.
- clarify documentation for periodic reschedule callbacks.
- verify that the passed callback argument is indeed a code reference, for earlier error reporting and a nice calling speed increase (as well as saving memory).
- libev - a high performance full-featured event loop written in C