> Could there be a Proxy.hasBeenRevoked(proxy) method?
The Proxy constructor only accepts targets and handlers when they are objects
and are not revoked proxies.
I wonder what's the point of not allowing revoked proxies but allow revocable
proxies which may be revoked later.
Anyways, this allows you to check if a value is a revoked proxy: you only need
to ensure that it's an object but makes Proxy throw.
I think something like this should work:
```javascript
Proxy.hasBeenRevoked = function(value) {
if(Object(value) !== value) {
return false; // Primitive value
}
try {
new Proxy(value, value);
return false; // Either non-proxy object or non-revoked proxy
} catch(err) {
return true; // Revoked proxy
}
};
```
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