Proxy.createFunction should accept an additional optional argument specifying the prototype of the function proxy. If the argument is not provided or is undefined, it should default to the original Function.prototype as it currently does. Proxy.createFunction should also test the argument to ensure that it is an instanceof Function and throw if not. Initial spec at the attached URL. Discussion here: https://mail.mozilla.org/pipermail/es-discuss/2011-February/012874.html It would be good to get this implemented as soon after Fx4 as possible, so we don't have too long a period of a public browser implementing Proxy without the extended API. We should discuss this API at the next TC39 face-to-face so it can get agreed to ASAP, but TomVC likes the idea so it looks promising. Dave

Marking this bug as invalid since Proxy.createFunction is not relevant in the direct proxies design. Feel free to change the status if I'm mistaken.