FYI we will soon be migrating various “jtv admin” messages to NOTICE commands (which will also help us with chat localization) - for instance toggling subsonly mode will look like this:
@msg-id=slow_off :tmi.twitch.tv NOTICE #twitch_user :This room is no longer in slow mode.
This will solve one issue with non-TWITCHCLIENT clients missing various messages.