Strange JavaScript behavior on Mac OS X

import QtQuick 2.0

Rectangle {
    width: 360
    height: 360

    property int a: -1
    property int b: 1

    Component.onCompleted: {
        for (var i = 0; i < 10000; i++) {
            var x = Math.min(a + 0, b + 0);
            if (x > 0) {
                console.log("min(-1,1) =", x);
                console.log("loop count =", i);
                return;
            }
        }
        console.log("OK");
    }
}