bug#20154: 25.0.50; json-encode-string is too slow for large strings

[Eli Zaretskii]

> Date: Mon, 23 Mar 2015 00:57:19 +0200
> From: Dmitry Gutov <dgutov@yandex.ru>
> CC: 20154@debbugs.gnu.org
> 
> On 03/20/2015 06:02 PM, Eli Zaretskii wrote:
> 
> > I suggest to rewrite json-encode-char, it does a lot of unnecessary
> > stuff, starting with the call to encode-char (which was needed in
> > Emacs 22 and before, but no more).
> 
> Continuing this line of thought, should we also remove the alias for 
> `decode-char', as well as its one use in `json-read-escaped-char'?

Yes, I recommend that.