From: Mark S. Miller [mailto:erig...@google.com]
> In this situation, it will try and succeed. This more closely obeys the
> intent in the original code (e.g., the comment in the jQuery code), since it
> creates a non-configurable property on the *Window* W. It does not violate
> any invariant, since all that's observable on the *WindowProxy* (given the
> rest of your draft spec, which remain unchanged) is a configurable property
> of the same name.
Ah, I see! So then another non-intuitive (but invariant-preserving) consequence
would be:
```js
Object.defineProperty(window, "prop", { value: "foo" });
var propDesc = Object.getOwnPropertyDescriptor(window, "prop");
if (propDesc.configurable) {
Object.defineProperty(window, "prop", { value: "bar" });
// this will fail, even though the property is supposedly configurable,
// since when it forwards from the WindowProxy `window` to the underlying
// Window object, it the Window's [[DefineOwnProperty]] fails.
}
```
Am I getting this right?
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