Add the "loopback" flag. #1
Merged
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The "loopback" flag is used to emit messages on the local endpoint of
a socket; e.g., allowing the server to send a message to the server's
handler directly.
This is especially useful in conjunction with rooms, as it allows the
server to proactively trigger behavior for each socket in a room without
having to maintain a separate list of said sockets or relying on the
client endpoint to trigger the behavior.