Object.seal, read references, and code reliability

[Oriol _]

> Why do you think `[[Get]]` needs a flag? The object will have the flag on it, and `[[Get]]` has the object.

I also think a new flag or something similar is needed, because it would be good to throw if some object in the prototype chain is locked, not necessarily the receiver.
I would expect this:

```js
let locked = Object.lock({});
let inherits = Object.create(locked);
Reflect.get(locked, "foo"); // TypeError
Reflect.get(locked, "foo", {}); // TypeError
Reflect.get({}, "foo", locked); // undefined
Reflect.get(inherits, "foo"); // TypeError
```

-Oriol

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