This module implements AnyEvents strict mode.
Loading it makes AnyEvent check all arguments to AnyEvent-methods, at the
expense of being slower (often the argument checking takes longer than the
actual function). It also wraps all callbacks to check for modifications
of $_, which indicates a programming bug inside the watcher callback.
Normally, you dont load this module yourself but instead use it
indirectly via the PERL_ANYEVENT_STRICT environment variable (see
AnyEvent). However, this module can be loaded manually at any time.