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var a = [1, 2, 3, 4];
var count = 0;
function f(arr, i) {
arr[2] = i;
}
for (var i=0; i<80; i++) {
f(a, i);
assertEq(a[2], i);
}
delete a[2];
f(a, 50);
assertEq(a[2], 50);
Object.defineProperty(Object.prototype, "2", {
set: function() { count++; }
});
delete a[2];
f(a, 100);
f(a, 100);
assertEq(a[2], undefined);
assertEq(count, 2);