Ethan Glasser-Camp <ethan.glasser.camp@gmail.com> writes:

> Writing this buffer using C-x C-w encodes it correctly too. So I think
> this is an emacs MIME problem. We call mm-save-part, which calls
> mm-save-part-to-file, which calls mm-with-unibyte-buffer. Hmm..
>
> Indeed, it seems that inserting this character into a file that's been
> marked "unibyte" using (set-buffer-multibyte nil) turns it into the ^Y
> character (ASCII code 0x19 -- the character that comes out in the patch
> file). There's probably a technical reason that this should be true, but
> I can't think of why that would be.

The more I think about this, the more convinced I become that this is a
bug in emacs's multibyte handling. I've filed a bug, see:

http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12925

But I think Tomi's going to formalize his hacky patch and send that out
later too. When he does, it has my +1.

Ethan