BUG #3720: wrong results at using ltree

The following bug has been logged online:

Bug reference:      3720
Logged by:          M. Palm
Email address:      m.palm@geoinsoft.de
PostgreSQL version: 8.2.4
Operating system:   Windows Server 2003 Web Edition
Description:        wrong results at using ltree
Details:

I think I found a bug in the ltree module. The following query should return
false but I get true.

SELECT '5.0.1.0'::ltree ~ '5.!0.!0.0'::lquery

I get the same result with the 'ltree.dll' of PostgreSQL 8.2.5. If you have
a solution of the problem I would be very happy.