2013/1/20 Kevin Smith <khs4...@gmail.com> > > It is not. At the exit of the get trap, the JS engine checks whether >> invariants should be enforced for the given property on the target. In your >> case, the runtime sees that the target has a non-configurable non-writable >> property called 'foo' with 1 as value. When you try to return 0, it will >> throw a TypeError because of invariant violation. You can read about >> invariants at >> http://wiki.ecmascript.org/doku.php?id=harmony:direct_proxies#invariant_enforcement >> >> > Excellent - thanks for the link! >
I wrote an introductory article a while back explaining precisely the interaction between frozen objects and proxies, and the invariant checks. Easier to digest than the draft spec on the wiki: http://soft.vub.ac.be/~tvcutsem/invokedynamic/frozen-proxies Cheers, Tom
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