To a certain extent, my tongue was firmly located in my cheek when I posted this; there are no hard and fast spelling rules for what is primarily a spoken dialect, but there is a mistaken idea among many prescriptivists that non-standard usage has no rules. This is far from true. One can, for example, say, "I ain't got no money," but not, "I don't ain't got no money." This despite the fact that it is perfectly correct to say, "I might could use some money." Being a descriptivist is more than just saying anything goes. To be a real descriptivist one must describe what is used. Prescriptivists can just say that something is wrong and then ignore it, but a descriptivist has to say what the rules are and to whom they apply.