chromium/src/third_party/blink/web_tests/fast/js/regress/script-tests/method-on-number.js

function foo(a) {
    var result = 0;
    for (var i = 0 ; i < 500000; ++i)
        result += a.valueOf();
    return result;
}

var result = foo(5);

if (result != 2500000)
    throw "Bad result: " + result;