Status of Fix Domain Casting TODO

I'm wondering if Gevik has had any time for further work on
http://archives.postgresql.org/pgsql-hackers/2006-09/msg01738.php ?

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. My intention was to use that as the basis for an 'md5data'
domain (unfortunately, calling the domain simply 'md5' results in a
conflict with the built-in md5 function). So something to consider on
the domain casting is the case of casting from domain A to domain B to a
base type.
-- 
Jim Nasby                                            jim@nasby.net
EnterpriseDB      http://enterprisedb.com      512.569.9461 (cell)