2013/9/12 Mark S. Miller <[email protected]> > Membranes need shadow targets, because of non-extensibility of objects and > non-configurability of properties. This special case of > no-invariants-anywhere is not JavaScript. Trying to do membranes without > shadow targets is a useless exercise. >
True, but by removing the invariant check on getPrototypeOf, a membrane proxy can now avoid the cost of actually storing the wrapped prototype on the shadow target until the real target becomes observably non-extensible (which may never occur). More generally, membranes always need to be set-up with shadow targets, but they don't actually need to use them until the real target has some invariants. Cheers, Tom
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