What about
Gtk2::EVENT_STOP # value 1
Gtk2::EVENT_PROPAGATE # value 0
Glib::SOURCE_CONTINUE # value 1
Gtk2::SOURCE_REMOVE # value 0
From nosing around I think there's no single idea of true/false as
stop/continue, it varies with the different callbacks etc, so confine
the names to a particular context, and try to match the jargon in the
docs.
EVENT_PROPAGATE is probably the most often wanted. Is that name enough
to reduce confusion? Reducing chance of confusion of course being the
the whole point of the exercise :-)