JSTests/microbenchmarks/object-assign-double-source.js

let o = { "0": 10.12, "1": 20.12, "2": 30.12, "3": 40.12, "4": 50.12, "5": 60.12, "6": 70.12, "7": 80.12, "8": 90.12, };
for (let i = 0; i < 1e4; i++) {
    Object.assign({}, o);
    Object.assign({ "3": -1 }, o);
}