Figuring out the behavior of WindowProxy in the face of non-configurable properties

[Yehuda Katz]

bz said:

> ES also allows other "exotic objects" that define some other behavior
> for those internal methods, but requires that the invariants be
> preserved.

Hixie said:

So one option would be to just say that WindowProxy is not an ES object.

---

If it's available to JavaScript consumers it must look like an object that
obeys ES invariants to JavaScript consumers. No (new, ugh) exceptions.
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