Flex datagrid universal numeric sorting function?

private function xmlDataGridNumericSorter(field:String):Function
{

    return function (obj1:Object, obj2:Object):int
    {
        var num:Number = ((Number)(obj1.attribute(field)) - (Number)(obj2.attribute(field)));
        return (num > 0) ? 1 : ((num < 0) ? -1 : 0);
    }

}

private function xmlDataGridNumericSorter(field:String):Function
{

    return function (obj1:Object, obj2:Object):int
    {
        var num:Number = ((Number)(obj1.attribute(field)) - (Number)(obj2.attribute(field)));
        return (num > 0) ? 1 : ((num < 0) ? -1 : 0);
    }

}

private function xmlDataGridNumericSorter(field:String):Function
{

    return function (obj1:Object, obj2:Object):int
    {
        var num:Number = ((Number)(obj1.attribute(field)) - (Number)(obj2.attribute(field)));
        return (num > 0) ? 1 : ((num < 0) ? -1 : 0);
    }

}

dataGridColumn.sortCompareFunction = xmlDataGridNumericSorter(xmlAttribute.name().toString());