There's a few goals I have in mind when thinking about proxies: * Ability to forward to target at minimal cost. * Minimal cost for invariant enforcement, preferably automatic since the result is predetermined * Near zero cost for invariant enforcement in the majority of cases where it's not needed * Ability to virtualize properties with minimal forced overhead (if someone eagerly deep clones a membrane then that's their cost, not the API's)
When something becomes invariant, then the runtime essentially takes ownership of it and it no longer belongs to the proxy. The proxy's only remaining power is being the first to know whenever something is about to happen. As the proxy creator, I don't really want to spend resources being responsible for something I no longer have any control over.
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