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// Array with sparse element (because non-writable).
var arr = [];
Object.defineProperty(arr, 0, {writable: false, configurable: true, enumerable: true, value: 0});
for (var p in arr) {
// Replace sparse element with dense element.
assertEq(p, "0");
delete arr[0];
arr[0] = 0;
arr[1] = 1;
arr.reverse();
}
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