bug#40693: 28.0.50; json-encode-alist changes alist

[Eli Zaretskii]

> From: "Basil L. Contovounesios" <contovob@tcd.ie>
> Cc: Dmitry Gutov <dgutov@yandex.ru>,  darthandrus@gmail.com,
>   40693@debbugs.gnu.org, João Távora
>  <joaotavora@gmail.com>
> Date: Mon, 18 May 2020 02:24:57 +0100
> 
> Large patch attached (fear not (too much); the bulk of it is new
> regression tests).  CCing João because it also touches jsonrpc.el.

Thanks, LGTM.