Quick foreword: I'm working on a skill that I did not create.

Per the Alexa documentation, setting the playBehavior to REPLACE_ALL is supposed to replace any enqueued speech with the latest command, however this is not working for me. My skill is using your code and I can confirm in my alexaApp.js file (which appears to be your index.js file) that if I log this.response.response.playBehavior, I see REPLACE_ALL in the console. Specifically I am logging it inside the response.send = function(exception) {... call. Thus, if your code is returning response.response, my question is, why is the playBehavior not respected?

I can tell it is not being respected because if I tap a visual element of my skill multiple times quickly, Alexa will repeat the same messages over and over again, sometimes for minutes, and this can happen even if I already closed the skill.

P.S. Is this project still being managed? Was it an alternative to Alexa's ASK Node.js SDK V1, and should my skill be using Alexa's ASK Node.js SDK V2 instead?