This module implements AnyEvent's 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 don't 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.