bug#55278: json-parse-string

[Richard Stallman]

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  > The two libraries aren't really compatible without reparsing the entire
  > parse tree returned by them.  For instance, the C library returns:

  > (json-parse-string "null")
  > => :null

  > While json.el says:

  > (json-read-from-string "null")
  > => nil

No deep difference between them is visible in this example.
What is the a deep difference? 

Is there a reason why they _must_ give different output formats
or is that difference just for historical reasons?
Could we make a version of the Lisp code
that produces the same output as jansson?
It would be slower but that is better than not running.

-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)