'revoke create on database' doesn't work as expected

Hi,

I'm having a bit of trouble using the 'revoke on database' feature
of postgresql 7.3. I've installed postgresql for the first time 2
days ago, so excuse me if I'm doing something stupid here ;)

Suppose I want to deny the user 'arnouten' the privilege of
creating tables in the database 'leenmarkt'. Logged in as 'postgres',
I so:

leenmarkt=# revoke create on database leenmarkt from public;
REVOKE
leenmarkt=# revoke create on database leenmarkt from arnouten;
REVOKE
leenmarkt=# revoke all on database leenmarkt from arnouten;
REVOKE
leenmarkt=# revoke all on database leenmarkt from public;
REVOKE

Now the datacl-field in pg_database is set to
'{=,postgres=CT,leenmarkt=CT}' for the database 'leenmarkt'.

arnouten is not superuser:

User name | User ID | Attributes
------------+---------+----------------------------
arnouten | 104 |
leenmarkt | 102 |
postgres | 1 | superuser, create database
teamherrie | 103 |

The database is owned by postgres:

List of databases
Name | Owner | Encoding
------------+----------+-----------
leenmarkt | postgres | UNICODE
teamherrie | postgres | UNICODE
template0 | postgres | SQL_ASCII
template1 | postgres | SQL_ASCII
test | postgres | SQL_ASCII

but still, when I log in as 'arnouten', I can create tables
in the leenmarkt database... Anyone a clue as to what I might
be doing wrong here?

I appreciate your remarks,

Regards,

--
Arnout Engelen <pgsql@bzzt.net>

"If it sounds good, it /is/ good."
-- Duke Ellington