Arrow function?

[mercmobily]

Hey Ye,

I am just wondering if it makes sense to have an arrow function here:

polymer-sortablejs/polymer-sortablejs.html

Line 15 in 5b7f08a

group : { type: Object, value: () => {return {name: Math.random()};}, observer: "groupChanged" },

Code reads:

  group             : { type: Object, value: () => {return {name: Math.random()};}, observer: "groupChanged" },

This line alone makes the Polymer binding totally incompatible with a lot of browsers out there!