Changed the multicast interface from a closure to a list of interfaces (so a list of channels can be used instead). If you really need a freeform closure, next and final already exist.
Changed the multicast interface from a closure to a list of interfaces (so a list of channels can be used instead). If you really need a freeform closure, next and final already exist.

mattgallagher/CwlSignal,mattgallagher/CwlSignal