FWIW a few lsp-mode users tested the build and it works as expected.

Thanks,
Ivan

On Tue, Jun 30, 2020 at 11:56 PM <phillip.lord@russet.org.uk> wrote:

> On 2020-06-30 15:26, Eli Zaretskii wrote:
> >> From: Phillip Lord <phillip.lord@russet.org.uk>
> >> Cc: 40003@debbugs.gnu.org,  npostavs@gmail.com,  yyoncho@gmail.com
> >> Date: Tue, 30 Jun 2020 12:13:05 +0100
> >>
> >> I have pushed a snapshot release of emacs-28 to alpha which contains
> >> this support as far as I can tell.
> >
> > Thanks.
> >
> >> "As far as I can tell" means
> >>
> >> (fboundp 'json-serialize)
> >>
> >> so any slightly more rigourous testing of this build against a real
> >> world use case would be appreciated.
> >
> > There's a small test suite in test/src/json-tests.el.
>
> Yes, I know, but the test suite tests the build and not the packaged
> version. We don't have any way to check that automatically.
>