Polyfilling Object.observe

[Oriol _]

> Every time I wish I could use `Proxy` in a simple way, there's always some issue with it. For example: https://jsfiddle.net/trusktr/hwfontLc/17

The main problem with that code is that the `prototype` property of a class is read-only, that's why you see no output. Blame classes instead of proxies.
And then inside the proxy traps you should use the target instead of the receiver if you want to avoid infinite recursion.
I have never had issues with proxies.

> So the following is what I'm using
Your function has various problems like assuming that you can define symbol properties in property descriptors and read them later, ignoring the receiver when calling getters and setters, assuming all objects are extensible and all properties are configurable, etc.

--Oriol
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