I’ve written up a guide to accomplishing two-way data-binding without 
bracket-notation 
<https://stackoverflow.com/questions/30631301/polymer-1-0-array-style-path-accessors-alternative-to-bracket-notation-in-exp/30655976#30655976>
 
with a sample usage case as an answer to a related question on Stack 
Overflow.

It seems very (unnecessarily?) complex compared to binding to obj[key] - 
but of course, I am not yet aware of the performance implications by both 
methods, so I cannot call any judgement.
​

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