function ascInsensitive(a, b) {
    var lowercaseA = String(a).toLowerCase();
    var lowercaseB = String(b).toLowerCase();

    if (lowercaseA < lowercaseB) {
        return -1;
    }

    if (lowercaseA > lowercaseB) {
        return 1;
    }

    return asc(a, b);
}
Sort in ascending order (case-insensitive).