Bug/Feature on polymer.concat.js when propagating value changes

[Leandro Cruz]

Hi all. I think I found a bug polymer.concat.js setValueFrom(). It updates the value of an attribute object when propagating a change. 

The "reproducer" is called bug.html. If you run it, it will show my name 'Leandro Rodrigo Saad Cruz' which came from object x. Now, if you set a new value using the set button, x.name is updated too.

Not sure if it's a bug or a feature? What do you say?

Cheers!

[Arthur Evans]

This is a feature -- this is why it's called two-way data binding. Your <my-sample> element publishes a property called `param` and the 

<my-input> element is binding that to `input.name`.

In fact, if you change your input element to:

<input id="in" value="{{param}}"/>

You can remove the button and on-click handler, and the values will be updated whenever the input's value changes.

Related docs:

https://www.polymer-project.org/docs/polymer/databinding.html#dynamic-two-way-data-binding

https://www.polymer-project.org/docs/polymer/binding-types.html#node-bindings

https://www.polymer-project.org/docs/polymer/polymer.html#published-properties

Cheers,

Arthur

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