bug#8545: issues with recent doprnt-related changes

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Paul Eggert <eggert@cs.ucla.edu>,  8545@debbugs.gnu.org,  
> emacs-devel@gnu.org
> Date: Fri, 06 May 2011 10:33:21 -0300
> 
> And we never show "length, including
> terminating nul-byte" to Elisp, so the nul-byte shouldn't matter

If you are sure of that, then I agree it's fine to use
MOST_POSITIVE_FIXNUM+1.  I wasn't sure.  I do see in C variables that
explicitly use the string position of the null byte; I was afraid that
they could somehow leak to Lisp.