Making this a Canny at Harold's request.
The name "listeners" in this context is confusing because we already have "listen" events. "handlers" is a more accurate term that is unambiguous and already in general use when discussing the subject. I suppose that "listeners" could potentially be kept as an alias for backward compatibility, if deemed necessary, but I feel that its use should be deprecated to avoid future ambiguity. (Not sure of the appropriate category for things like this. Calling it a Bug since it entails a change in the source code.)
https://secondlife.canny.io/admin/board/slua-alpha/p/change-the-name-of-lleventslisteners-to-lleventshandlers