Permissions not working?

Something seems to be wrong here unless I am doing something wrong that
I can't see.  Here is a dump of one session.

vex=> select version();
version
-------------------------------------------------------------------------
PostgreSQL 6.3.2 on i386-unknown-netbsd1.3B, compiled by gcc 2.7.2.2+myc1
(1 row)

vex=> SELECT relname, relacl FROM pg_class, pg_user
vex->   WHERE ( relkind = 'r' OR relkind = 'i' OR relkind = 'S') AND
vex->     relname = 'client' AND
vex->     usesysid = relowner
vex->   ORDER BY relname;
relname|relacl
-------+--------------
client |{"=","root=r"}
(1 row)

vex=> select user;
getpgusername
-------------
carol
(1 row)

vex=> select * from client;
ERROR:  client: Permission denied.

Exactly what I expected.  Now, here is another.

trends=> select version();
version
--------------------------------------------------------------------------
PostgreSQL 6.4.0 on i386-unknown-netbsd1.3.2, compiled by gcc 2.7.2.2+myc1
(1 row)

trends=> SELECT relname, relacl FROM pg_class, pg_user
trends->   WHERE ( relkind = 'r' OR relkind = 'i' OR relkind = 'S') AND
trends->     relname = 'client' AND
trends->     usesysid = relowner
trends->    ORDER BY relname;
relname|relacl
-------+---------------
client |{"=","db=arwR"}
(1 row)

trends=> select user;
getpgusername
-------------
darcy
(1 row)

trends=> select * from client;
[Rows returned as if I had permissions]

Am I missing something or did table permission protections get lost on
the way to 6.4?

--
D'Arcy J.M. Cain <darcy@{druid|vex}.net>   |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 424 2871     (DoD#0082)    (eNTP)   |  what's for dinner.