Ok, I see how I can do this with a sum type and a function on it; but
that's also a lot of repetitive setup.  Seems I could also just make a
function that acted on strings:

let message_to = function
	"accel" -> 1
	| "stop" -> 0  
	| _ -> -1;;

...which is perhaps less typing/editing up front, but a bit of a pain to
type all the "s in the code.

So, what's so wrong with just using variables?

let Accel = 1;;
let Stop = 0;;

seems pretty short to write and shortest to use...  Am I missing something
( elegant | obvious )?  Is that just ugly?

thanks
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