BUG #5661: The character encoding in logfile is confusing.

The following bug has been logged online:

Bug reference: 5661
Logged by: Mikio
Email address: tkbysh2000(at)yahoo(dot)co(dot)jp
PostgreSQL version: 9.0 RC1
Operating system: Windows XP SP3 Japanese
Description: The character encoding in logfile is confusing.
Details:

I'm using postgresql 9.0 rc1 on Japanese Windows XP.
I found character encoding is confusing in log files in pg_log directory.
Default character encoding of all of databases are UTF-8, and almost message
strings in log files are described by UTF-8 correctly.
But few lines are described by EUC_JP.
So 2 character encoding strings are existing in 1 log file and I can't read
the messages parts of logs.
Incidentally, client_encoding in postgresql.conf is commented out.

Thank you.