Spread operator and proxies

[pkamenarsky]

I have the following use case:

let st = {...};  // st is immutable

let stProxy = new Proxy(st, ...);

Now, I would like to use spread syntax to construct a new immutable version of stProxy:

let stProxy2 = {...stProxy, var: value};

However, the stProxy functionality would be lost then.

So what if {...st, ...} desugars to something like that instead:

Object.assign(st.clone ? st.clone() : {}, st, ...);

[sebmarkbage]

That's an interesting idea but I think that to make this work, the proxy would need to be able to be aware that this is happening. It could be a possible follow up proposal to Proxies to expand on a new hook that would enable this behavior.