Module NumTok.UnsignedNat
- val of_string : string -> t
- Convert from a non-empty sequence of digits (which may contain "_") (or hexdigits when starting with "0x" or "0X") 
- val to_string : t -> string
- Convert to a non-empty sequence of digit that does not contain "_" (or hexdigits, starting with "0x", all hexdigits are lower case)