| Subject: | Crashes when "host" argument is undef |
In the original AnyEvent::Handle, the `tcp_server` function binds to all IP addresses when the host argument is undef. This is sensible behavior.
However, when the host argument (the first element of the `bind` array) to AnyEvent::Handle::UDP is undef, it crashes and takes the process with it.
It should be changed to bind all addresses (ideally both '0.0.0.0' and '::') instead.