Object.freezing proxies should freeze or throw?

[Raul-Sebastian Mihăilă]

Claude, I don't see how non-extensibility and deleting properties are
connected.


> ```js
> var target = Object.preventExtensions({ x: 1 })
> var proxy = new Proxy(target, {
>     deleteProperty() { return true }
> })
>
> Object.isExtensible(proxy) // false
> delete proxy.x // true
> proxy.hasOwnProperty('x') // true
> ```
>
>
>
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