Tom Lane wrote:
> "Jim C. Nasby" <jim(at)nasby(dot)net> writes:
>> FWIW, I'm running into this trying to create a 'raw' domain that would
>> automagically convert hex strings into actual binary data for storage in
>> a bytea.
> I think you've got 0 chance of implementing that as a domain rather than
> an independent type. Without or without revisions in the casting rules,
> a domain has not got its own I/O functions, and never will.
This might be less of an issue if we allowed such IO functions to be
written in a loadable PL rather than in C.