On 9/26/13 5:16 AM, Tom Van Cutsem wrote:
I believe the crucial part of why this works is because the built-ins
can recognize trusted, cross-realm proxies, from arbitrary other proxies.

Yes, agreed.

Answering MarkM's question of whether we can self-host such behavior, I
believe we can:

```js
var trustedMembraneProxies = new WeakMap(); // maps trusted membrane
proxies to their target, allowing code with access to this WeakMap to
unwrap them

Ah, and another weakmap for the per-property security checks. Yes, I guess that would work.

-Boris
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