Bug with groups and access permissions (7.0.0RC1)

Hello.

It seems there is a 'referential integrity' bug with groups and permissions:

db=> CREATE USER user1;
CREATE USER
db=> CREATE GROUP group1 WITH SYSID 4 USER user1;
CREATE GROUP
db=> CREATE TABLE table1 (field1 integer PRIMARY KEY);
CREATE
db=> REVOKE ALL ON table1 FROM PUBLIC;
CHANGE
db=> GRANT ALL ON table1 TO GROUP group1;
CHANGE
db=> DROP GROUP group1;
DROP GROUP
\z
NOTICE:  get_groname: group 4 not found
The connection to the server was lost. Attempting reset: Failed.
!=>

Later...

db=> DROP USER userx;
ERROR: group groupy does not exist.
db=> SELECT * from PG_GROUP;
...
groupy | 5 | {1,4}
...
db=> DROP GROUP groupy;
DROP

Just one question: what's that???

Thanks.
--
Guillaume Perréal - Stagiaire MIAG
Cemagref (URH), Lyon, France
Tél: (+33) 4.72.20.87.64