There's a long explanation in the code of this commit that says this:
> TL;DR OF THE BELOW: if the first parameter looks like a channel in
> addition to message type, then filter by channel. Otherwise, don't
> filter by channel.
>
> Here's the issue: plugins are *usually* multiplexed by channel. But
> that's only for messages that target channels, such as PRIVMSG and JOIN.
> For non-channel messages, such as server status messages (such as 001 on
> connect, or 372 for MOTD, etc) we want to ignore the channel aspect of
> plugin multiplexing. In order to accomplish this, we just check if the
> first parameter looks like a channel - i.e., starts with an octothorpe #.
Signed-off-by: Alek Ratzloff <alekratz@gmail.com>
Alek Ratzloff
a0070fca38