Has Edge shipped with the changed behaviour? If it doesn’t break anything 
badly, improved performance is likely the most observable impact of it.

Since the most common receiver are arrays, and array index accessors are 
probably not super common, probably not too many problems are expected

> On Jul 16, 2015, at 3:55 PM, [email protected] wrote:
> 
> Answering my own question:
> 
> https://bugs.ecmascript.org/show_bug.cgi?id=2607
> 
> Looks like neither Allen nor Brian realized that this changed behavior in ES5,
> not just ES6 proxies.
> 
> https://codereview.chromium.org/1238593003/
> 
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