Re: [HELP] (bug?) Saving a buffer without any conversion?

[Richard Stallman]

    If the process' input coding system is no-conversion or raw-text, the
    string argument to the filter function is a unibyte string; otherwise
    it is a multibyte string.  Use `string-as-multibyte' on a unibyte
    string before inserting it in a multibyte buffer.

You might or might no want to use string-as-multibyte, depending
on what results you want to get.

    In any case, I have just confirmed that if you DON'T use a filter
    function, but rather relies on emacs itself to insert received data
    into the buffer, it works nicely even with a multibyte buffer.

Does that mean it does the equivalent of using string-as-multibyte?