Inconsistent event values for isFirst, isFinal, and eventType

[lowjam]

I am seeing events fired consistently but do not see isFirst set consistently on Pan and Pinch events. On Pan events, isFinal is set to true consistently, but on Pinch events isFinal is not set correctly.

It looks like eventType consistently returns a 4 a the end of an event, but does not consistently return a value of 1 when pan and pinch events start.

Other details:

• Chrome 51.0.2704.63
• Windows 10
• I'm using HammerJS in a Polymer Web Component.

Here is my setup code:

var tlFrame = this.$.tlFrame;
var mc = new Hammer(tlFrame);
mc.on("pan", function(e) {
  _self.handleTrack(e);
});

mc.get('pinch').set({ enable: true });
mc.on('pinch', function(e) {
  _self.pinchScale = e.scale;

  if (e.eventType === 1) _self.consoleLog('[PINCH] Start');
  if (e.eventType === 4) _self.consoleLog('[PINCH] End');
});

When I do 4 pinch actions on my laptop touchscreen, this is the console output I see: