question re proxy handler "apply" method

[jmdyck]

Consider a proxy object whose handler has an "apply" method and whose target is not a function object.

It looks like, because target isn't callable, ProxyCreate would have created the proxy object without a [[Call]] internal method, so the proxy object isn't callable, even though there's that "apply" method that could service a call.

So if you want the handler's "apply" method to be invoked, you have to create the proxy with a target that's a function, even though the latter won't be called?

[ljharb]

related to #814

Yes, i believe that is the case.

cc @erights and @tvcutsem for background.