Maybe I didn't understand correctly, but I think this invariant is not enforced.
```js
var obj = Object.preventExtensions({foo: "bar"});
// Object is non-extensible
Object.isExtensible(obj); // false
// foo is an observable own property
!!Object.getOwnPropertyDescriptor(obj, "foo"); // true
delete obj.foo;
// [[HasProperty]] returns false
"foo" in obj; // false
```
-Oriol
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