Instances of this class represent a message buffer allocated by nanomsg. New empty buffers can be
allocated using "nn_allocmsg". Both "nn_recv" and "nn_recvmsg" can be used to allocate buffers
initialised with the contents of a received message.
"NanoMsg::Raw::Message"s can be used to send and receive data in a zero-copy fashion.
When using a message instance as a string, its overloading will produce a string containing a copy of the
buffer content.
A string pointing to the actual buffer content, without having to create a copy of it, can be obtained by
dereferencing the message instance as a scalar.
copy($data)
$msg->copy('foo');
Copies $data to the beginning of the buffer. If the data is larger than the space allocated for the
buffer, an exception will be thrown.