problem with casts dump/restore

I just noticed that pg_dump does not seem to be exporting at least one
of my user defined casts...In particular, this one:

CREATE CAST (xid AS oid)
WITHOUT FUNCTION;

On a sort of related note, I noticed that pgAdmin 2.0 generates this
code in the SQL window for the above cast...

CREATE CAST (xid AS oid)
WITHOUT FUNCTION
AS EXPLICIT;

'create cast' does not have an 'explicit' cause...although IMHO maybe it
should (there is an 'e' in pg_cast.castcontext).

Merlin