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function f(o) {
for (var i = 0; i < 100; i++) {
o["a" + i] = i;
}
for (var i = 0; i < 100; i++) {
delete o["a" + i];
}
o.x = 123;
assertEq(Object.keys(o).length, 1);
}
f({});
f([]);
let obj = newObjectWithManyReservedSlots();
f(obj);
checkObjectWithManyReservedSlots(obj);