Hi,

I would like to have the following properties:

1) Define type aliases:

     type year = int
     and month = int

2) Don't hide their representation and derive the primitives from the
   original type:

     # let next_year = current_year + 1 ;;
     val next_year : year = 2003

   (+) and 1 would be silently converted to types using year instead of
   int.


3) Prohibit the mixing of different types that do not derive from each
   other, without an explicit cast:

     let my_mistake = year + month   (* Type error! *)

   where year has type year and month has type month.
   But this could be valid:

     let some_int = (year :> int) * 13 + month


Basically, I would like to minimize the risk of error when I manipulate
simple datatypes like numerical parameters or int/string identifiers.


Thanks for any suggestion!

Martin

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