[towelrod]

Maybe we get different search results. When I search for 'perl json' it leads to http://search.cpan.org/~makamaka/JSON-2.90/ which is a mature and easy to use JSON client. It does talk about backwards incompatible changes from version 1.0 -- but that was back in 2007.

When I search for 'ruby json' I get http://ruby-doc.org//stdlib-2.0/libdoc/json/rdoc/JSON.html, which is part of the standard library.

When I search for 'java json' I get several libraries, all of which are actively supported: www.json.org/json, gson, and Jackson.

I don't really understand your comment about significant implementation issues that aren't issues at all with Tcl. Could you give an example? What edge cases aren't covered by the standard Perl and Ruby JSON libraries?