[Haskell] new "primitive" instances of Data?

[Abraham Egnor]

I'm in the process of trying to write generic binary serialization code
using the "Scrap Your Boilerplate" method.  One bump I've run into is that
there are no instances of Data provided for the extended set of numeric
types (the stuff in Data.Word, etc.) and it seems to be impossible to
hand-write an instance that behaves similarly to the instances for other
primitive types.  Any ideas for ways around this?