MLton 20210117

# MLtonWord

    signature MLTON_WORD =
       sig
          type t

          val bswap: t -> t
          val rol: t * word -> t
          val ror: t * word -> t
       end

- type t

  the type of words. For MLton.LargeWord this is LargeWord.word, for MLton.Word this is Word.word, for MLton.Word8 this is Word8.word, for MLton.Word16 this is Word16.word, for MLton.Word32 this is Word32.word, for MLton.Word64 this is Word64.word.

- bswap w

  byte swap.

- rol (w, w')

  rotates left (circular).

- ror (w, w')

  rotates right (circular).