Name proliferation in functions with OUT parameters

Hi developers! Hi Dave!

Testing pgAdmin III v1.6.3 rev: 6112, client Win XP, host: Debian Sarge,
PG 8.1.8.

I got nonsensical error messages when trying to change properties of a
function in the properties dialogue window.
After some investigation I was able to build the following, very simple
testcases that should demonstrate the problem.

1.) 2 unnamed IN parameters, 1 named OUT parameter

CREATE FUNCTION test1(integer, integer, OUT a integer) AS
'SELECT 1, 1;'
LANGUAGE 'sql' VOLATILE;
Now, try changing the volatility to "STABLE" in the properties dialogue
window. It seems to work, but pgAdmin messes with parameter names:

That's the actual command sent back to the database:
CREATE OR REPLACE FUNCTION test1(IN a integer, IN integer, OUT
integer) AS
'SELECT 1;'
LANGUAGE 'sql' STABLE;

Note how the name was "a" was transferred to the first IN parameter.
(The IAEA would call this illegal proliferation!!)

2.) 2 unnamed IN parameters, 2 named OUT parameter

CREATE FUNCTION test2(integer, integer, OUT a integer, OUT b integer) AS
'SELECT 1, 1;'
LANGUAGE 'sql' VOLATILE;
Try changing the volatility to "STABLE" in the properties dialogue
window again. This time it fails with an error message.

The command sent to the database:
CREATE OR REPLACE FUNCTION test2(IN a integer, IN b integer, OUT
integer, OUT integer) AS
'SELECT 1, 1;'
LANGUAGE 'sql' STABLE;

The logged error message:
FEHLER: kann Rückgabetyp einer bestehenden Funktion nicht ändern
DETAIL: Der von OUT-Parametern bestimmte Zeilentyp ist verschieden.
TIPP: Verwenden Sie zuerst DROP FUNCTION.
ANWEISUNG: CREATE OR REPLACE FUNCTION test2(IN a integer, IN b
integer, OUT integer, OUT integer) AS
'SELECT 1, 1;'
LANGUAGE 'sql' STABLE;

Not sure why postgres wouldn't throw an error in the first case. Looks
like the same error to me. Maybe a glitch in postgresql itself?

3.) 1 unnamed IN parameters, 1 named OUT parameter

CREATE FUNCTION test3(IN a integer, integer, OUT b integer) AS
'SELECT 1;'
LANGUAGE 'sql' VOLATILE;

Gets transformed to:
CREATE OR REPLACE FUNCTION test3(IN a integer, IN b integer, OUT
integer) AS
'SELECT 1;'
LANGUAGE 'sql' STABLE;

4.) 2 named IN parameters, 2 named OUT parameter

CREATE FUNCTION test4(IN a integer, IN b integer, OUT a integer, OUT b
integer) AS
'SELECT 1,1;'
LANGUAGE 'sql' VOLATILE;

This example finally works as it should. You get the idea ...
Names of OUT parameters are "shifted" to unnamed IN parameters, one
after the other.

Regards
Erwin