dublicate handles in LiveUser

Hello,

id it true that LU doesn't take care about if an handle is already exist?
I have tested it and had after them three times user "tester" but with 
different auth_user_id.

mysql> select * from liveuser_users where handle="tester";
+--------------+--------+----------------------------------+-----------+---------------+----------------+-----------+
| auth_user_id | handle | passwd                           | lastlogin | 
owner_user_id | owner_group_id | is_active |
+--------------+--------+----------------------------------+-----------+---------------+----------------+-----------+
| 2            | tester | 47c5ddb680e4397d7e8a099438819831 | NULL      |        
  NULL |           NULL | Y         |
| 3            | tester | 1b4da9076839e54e14cf239d63de03f4 | NULL      |        
  NULL |           NULL | Y         |
+--------------+--------+----------------------------------+-----------+---------------+----------------+-----------+

>From my config array I have set "allowDuplicateHandles = 0".

Is this an normal behavior or an bug or somewhere my fault?

Thanks
-Peter