Request for a HEX datatype

It seems that there is a need for a hex datatype in Schema datatypes.  In a situation where you have a high volume conversion of numeric values, the performance benefit from the simplier conversion
could be significant.

It is possible that you could add a hex datatype as a user generated datatype, but I would assume that generic RegExp code would not be as efficient as a built in validator and a type-aware parser
would not recognize that the derived class could be converted to a numeric type.  I would suggest a lexical pattern of Ox[0..F]*