bug when creating/dropping function with a user defiend domain (adds size)

hi when i execute the following script using pgadmin query tool:

windows xp, sp2

pgadmin 1.8.2 as installed whith postgres binary 8.3.1

--------------------------------

CREATE DOMAIN "dt_0" AS varchar(32)

NULL;

CREATE DOMAIN "dt_1" AS varchar

NULL;

CREATE FUNCTION "x1" (IN name dt_0, IN description dt_1)

RETURNS integer

AS $$

SELECT 0;

$$

LANGUAGE SQL

IMMUTABLE

RETURNS NULL ON NULL INPUT;

---------------------------

when i look at the function definition using pgadmin it looks like this:

-- Function: x1(dt_0(36), dt_1)

-- DROP FUNCTION x1(dt_0(36), dt_1);

CREATE OR REPLACE FUNCTION x1("name" dt_0(36), description dt_1)

RETURNS integer AS

$BODY$

SELECT 0;

$BODY$

LANGUAGE 'sql' IMMUTABLE STRICT

COST 100;

ALTER FUNCTION x1(dt_0(36), dt_1) OWNER TO postgres;

--------------------------

if i try to delete it: i get:

an error has occured: tyep modifier is not allowed for type "dt_0"

why is the (36) there????

regards