Proxies seem to be able to support this well given a little bit of extra specification. A proxy attempts to forward the apply/construct action naively to its target. The result is it either succeeds or doesn't, and the same invariant checks would apply (private names have the same rules for configurability right?).
The only difference is that a proxy won't know the result before actually attempting to follow through, which means that private non-configurable properties are a kind of booby trap if you *don't* always forward everything.
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