In addition to the concerns I’ve already outlined, another was brought up 
by a user on StackOverflow 
<https://stackoverflow.com/questions/30631301/polymer-1-0-array-style-path-accessors#comment49332400_30632542>
 
that I hadn’t even thought of - two-way data binding.

*Using a computed property to bypass the lack of support for obj[key] means 
that the binding will be only one-way*. This is another important factor to 
consider.
​

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