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ES6 will allow for low-level extensibility with Proxies (http://wiki.ecmascript.org/doku.php?id=harmony:proxies).

That's true, and definitely worth pointing out. I've used them a fair bit, and while they provide exellent power, they are slightly cumbersome to use compared to Python's pervasive "overloadability" (for the lack of a better word). But I would give them a chance to grow on me before passing any further judgement.

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