Re: Emacs-diffs Digest, Vol 2, Issue 28

[Richard Stallman]

    [...]
            * process.c (read_process_output): Decide the multibyteness of
            string given to a process filter by a coding system used for
            decoding the process output.

    But, I don't remeber the detail now.

set-process-multibyte should be a good solution.