Change events happen four times with new 5e character sheet?

I've been trying to set up some notifications and other events around changing HP in a new script, and I've noticed that with the 5e Re-Shaped sheet a token change event seems to fire four times each time a user actually changes the value.  Example code: on('change:graphic:bar1_value', function (token, prev) { if(token.get('bar1_value') == 0 && prev.bar1_value > 0) { sendChat("Death","OH, THAT WAS UNFORTUNATE."); } }); In my game using the official 5e Re-Shaped sheet, if I select a PC token and change its HP to 0, I will see the message four times. This means not only is it registering 4 change events, it is also doing so 4 times simultaneously since prev still thinks HP == 0.  Anyone have any thoughts on a) what might be going on or b) how I can limit notifications to just one?

You probably have four of those tokens in your campaign on various maps and each one is having its bar value changed.

Do you have 4 tokens that represent that character?  You could create a notification function wrapped in _.debounce() so that the message only happens once per group of notifications. 

Ah, yes, I do! I figured the copies of a token would be treated as instances of a single data object, didn't realize it was treating each one as a unique change event when they sync. I'll try debounce() and see how it goes!

Could also do some gating based on the playerpageid and Player specific pages attributes of Campaign()

_.debounce() ended up being the right fix, once I realized the examples I found were for lodash instead of underscore... d'oh!