BUG #3237: function to_char() returns wrong value

The following bug has been logged online:

Bug reference:      3237
Logged by:          Robert wang
Email address:      robert.wang@eitec.com.tw
PostgreSQL version: 8.2
Operating system:   Windows 2000 professional
Description:        function to_char() returns wrong value
Details:

I run this following SQL command in pgAdminIII:

Select to_char(12345,'00000')

but it always returns ' 12345' (hex code: 20 31 32 33 34 35).It always adds
one space char in the left side.

I have to use another function substring() as followings to get my expected
value.

Select substring(to_char(12345,'00000'),from ' ' for 5)

it exactly returns '12345' which I expect.