client libpq multibyte support

Hi,

A client application using libpq made by non-MULTIBYTE
can not talk to server made by MULTIBYTE.

(Example)
------------------------------------------------------------
A_server(non-MULTIBYTE) B_server(--enable-multibyte=EUC_JP)
| |
--+----------+----------+-- network
|
C_server(non-MULTIBYTE)

By using the C_server's psql(+non-MULTIBYTE-libpq),
prompt> psql -h B_server
admin=# set client_encoding='SJIS';
SET VARIABLE
admin=# \dt
List of relations
Name | Type | Owner
------------+-------+-------
SJIS_KANJI | table | admin
(1 row)

admin=# select * from SJIS_KANJI ;
\: extra argument ';' ignored
\: extra argument ';' ignored
Invalid command \. Try \? for help.

(Here, "SJIS_KANJI" is SJIS multibyte code.)
-----------------------------------------------------------

Is this a specification ?

I hope that a client 7.0-libpq and an application always be
made by "configure --enable-multibyte" even if MULTIBYTE isn't
necessary for backend. If so, the above problem will be solved.

--
Regard,
SAKAIDA Masaaki -- Osaka, Japan