dom-repeat: Duplicate values result in unsynchronized data

[kevinpschaaf]

The collection-based key abstraction currently assumes unique array element identity.

Problem can be observed here (type bbbbb in the top input, and observe data out of sync):
http://jsbin.com/rabize/edit?html,output

[zmoshansky]

+1, this would be really nice to have.
The workaround as suggested #2667 (comment) is to wrap primitives in an object.
['analgesic', null, 'analgesic' ] -> [{k: 'analgesic'}, {k: null}, {k: 'analgesic'}]

[luna-duclos]

I've come across this issue as well, it's quite a big problem when having an array of any non object type

[rwestlund]

I just ran into this with 1.4.0, but I don't believe I have duplicate values in my string array.

I have this tap handler:

addStep: function() {
    this.push("recipe.directions", "");
}

and I'm using paper-inputs for each recipe.directions element within dom-repeat. I'm adding text to each step before I add the next one, so I don't think there are ever duplicate values.

I found the following workaround:

this.push("recipe.directions", new String());

This likely works because typeof new String() === 'object'

[Pupix]

@kevinpschaaf are you still working on this? Would be nice to not have such a constrain on value uniqueness, especially when talking about binding on form inputs.

[TimvdLippe]

Original JSBin is now working correctly with Polymer 2, thus I am closing this issue.