BUG #5788: I can drop table , with other user's table

The following bug has been logged online:

Bug reference:      5788
Logged by:          nobuyuki yoshida
Email address:      nob-yoshida@fissc.co.jp
PostgreSQL version: 8.4.5
Operating system:   centos 5.5
Description:        I can drop table , with other user's table
Details:

Hi. I found a bug:I can drop a table with not owner user.
Document says "Only its owner can drop a table.", but a fuct is not so.

Here is steps to reproduce:
1. command with postgres on psql
   create schema scm_test;
   create user scm_test;
   alter schema scm_test owner to scm_test;
   create table scm_test.test (id char(10));

2. command with scm_test on psql
   drop table test;

Then, success drop user postgres's table with user scm_test!