bug#70007: [PATCH] native JSON encoder

[Theodor Thornhill via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Mattias Engdegård <mattias.engdegard@gmail.com>
>> Date: Tue, 26 Mar 2024 16:33:52 +0100
>> 
>> If we replace the lisp-to-JSON encoder with native code, we would not need the jansson library for it and it would be faster.
>> 
>> There is ongoing work on a JSON-to-lisp parser, but the author has made it clear that he does not have time to write an encoder, so I spent a morning mashing up the attached patch.
>
> Thanks for working on this.
>
>> It generally produces the same result as the old code, except:
>> 
>> - The old code incorrectly accepted strings with non-Unicode characters (raw bytes). There is no reason to do this; JSON is UTF-8 only.
>
> Would it complicate the code not to reject raw bytes?  I'd like to
> avoid incompatibilities if it's practical.  Also, Emacs traditionally
> doesn't reject raw bytes, leaving that to the application or the user.
>
>> I'd be very happy if someone could test it with packages that use this interface (json-serialise, json-insert).
>
> Yes, please.

I've been using this along with the json-to-lisp parser for some time
now, and I'm really happy to see these improvements. Thanks a lot!

I haven't seen any issues thus far, and emacs is much more responsive.

I hope both of these patches will soon arrive on emacs 30.

I'll continue using and testing both until then.

Thanks,
Theo