MUC: optimizations for broadcast of visitor presence (thanks Jitsi team) This avoids doing performing unnecessary work in the case of visitors joining a MUC, no functionality changes are intended.

local set = require "util.set";

return {
	available = set.new{
		-- mod_bookmarks bundled
		"mod_bookmarks";

		"s2sout-pre-connect-event";
	};
};