Angular Polymer data-binding

Question

I want to make two way data binding between Polymer and Angular, for this I am using Angu-poly library.

Here is a link to an example which is working, while passing

Answer 1

I think it is because of some kind of reference.

How should I explain, just like you work with object in scope in data binding. when you update the object to a new object, the UI will not update with new object values.