When adding an element in array, using splice method, and then change a
subproperty from the added item, the path from array observation is not the
correct one.
Let's say we have a persons array with 11 objects, each object having name
and age as properties. When adding a person {name: Sim, age: 24} on
position 2, and after change the property name of person Sim, the observer
method returns the path "data.#11
<https://github.com/Polymer/polymer/issues/11>.name".
I expected the path to be "data.#2
<https://github.com/Polymer/polymer/pull/2>.name" because I added the item
on the second position.
Here is a jsfiddle that reproduces the error.
https://jsfiddle.net/simona_butnaru/zfwewthr/5/
I made a little research and I've seen that the issue is from polymer, at
the add function from Polymer.Collection. This line (var key =
this.store.push(item) - 1;) sets the key to be the length of array, and I
think the key shoud be the position where the item was added in array.
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