bug#23750: 25.0.95; bug in url-retrieve or json.el

[Eli Zaretskii]

> Cc: 23750@debbugs.gnu.org, monnier@IRO.UMontreal.CA, sdl.web@gmail.com
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Mon, 20 Jun 2016 20:16:37 +0300
> 
> On 06/20/2016 05:38 PM, Eli Zaretskii wrote:
> 
> > Or just use concat,
> > and test the result with multibyte-string-p before sending.
> 
> Actually, here's a reason why we might prefer not to replace 
> string-as/to-unibyte with multibyte-string-p: string-to-unibyte works 
> fine if the string's contents only contain ASCII/8-bit characters, even 
> if the string itself is multibyte. But multibyte-string-p returns nil 
> for such strings anyway.

We can replace the call to multibyte-string-p with a comparison of
what 'length' and 'string-bytes' return.  That should overcome this
issue.