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function test() {
var o = {x: 1, y: 2};
var p = new Proxy(o, {});
var keys = ["x", "y"];
var res = 0;
for (var i = 0; i < 300; i++) {
var key = keys[i & 1];
res += p[key];
}
assertEq(res, 450);
}
test();