comments in argument list of plpgsql get stripped?

Hi,

How can I store inline comments in the argument list of a plpgsql function to document complex overloaded functions with lots of arguments? It seems that PostgreSQL accepts the comments, but strips them as the function gets stored.

I am using PostgreSQL 9.1.2.

+++
CREATE FUNCTION func_test(
-- comment for argument 1
-- quite longish, explaining the details
argument1 TEXT
-- comment for argument 2
-- even more information
, argument2 TEXT
)
RETURNS smallint AS
$BODY$
BEGIN
-- this comment gets stored correctly
RETURN 1;
END;
$BODY$
LANGUAGE plpgsql IMMUTABLE
COST 100;
+++

According to the server log file PostgreSQL gets sent all the comments correctly, so it is not the client that already strips the comments.

+++
[...]
statement: CREATE FUNCTION func_test(
-- comment for argument 1
-- quite longish, explaining the details
argument1 TEXT
-- comment for argument 2
-- even more information
, argument2 TEXT
)
RETURNS smallint AS
$BODY$
BEGIN
-- this comment gets stored correctly
RETURN 1;
END;
$BODY$
LANGUAGE plpgsql IMMUTABLE
COST 100;
+++

select func_test('foo', 'bar');
func_test
-----------
1
(1 row)

Best regards,
Ralph