2011/10/18 David Bruant <bruan...@gmail.com>
>
> Ok for typeof. But there are other places where [[Call]] is used and the
> proxy is expected to (indirectly) expose it. For instance bind:
> -----
> var fpb = Function.prototype.bind;
> var bind = fpb.bind(fpb);
> var p = Proxy.for(function(){}, {}); // purposefully no 'call' trap
> var p2 = bind(p, {}); // ?
> -----
> Here, bind will look for an internal [[Call]] from p. What is it? It cannot
> be the call trap since this one doesn't exist. Fallback to target.[[call]]?
>No, the way I see it, for a direct proxy wrapping a target whose typeof is "function", that proxy's internal [[Call]] tries to invoke the call trap, so its spec would be something like: [[Call]] ( Receiver, Args ) 1. Let H be the [[Handler]] property of the proxy 2. Let callTrap be the result of calling the [[Get]] internal method on H passing "call" as an argument 3. If callTrap is undefined or IsCallable(callTrap) is false, throw a TypeError 4. Return the result of calling the [[Call]] internal method of callTrap, passing Receiver and Args as arguments 'bind' will wrap the above [[Call]] method, which I think works out fine. Cheers, Tom
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