bug#31138: Native json slower than json.el

[Lars Ingebrigtsen]

This was a very long thread, but it looks like the performance issues
were fixed by:

commit c26556bd18f8ca1e891bd1750c9f95b21ea457b0
Author:     Eli Zaretskii <eliz@gnu.org>
AuthorDate: Sat Nov 23 11:27:43 2019 +0200

    Fix and speed up en/decoding of UTF-8 strings
    
So is there anything more to be done in this bug report?

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   bloggy blog: http://lars.ingebrigtsen.no