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// Return undefined if the trap returns undefined
var target = {};
Object.defineProperty(target, 'foo', {
configurable: true
});
var handler = { getOwnPropertyDescriptor: () => undefined };
for (let p of [new Proxy(target, handler), Proxy.revocable(target, handler).proxy])
assertEq(Object.getOwnPropertyDescriptor(p, 'foo'), undefined);
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