Am I missing something or should this be listed on the core modules section of http://perldoc.perl.org? I don't think you're missing anything, it should.
perldoc.perl.org has a bunch of bugs, like including formatting codes (bold/italic) in anchors, not creating anchors for h4 like it does for h1/h2/h3 (ex http://perldoc.perl.org/perlre.html#Which-character-set-modifier-is-in-effect%3f )
And the maintainers website is down, but 5.18 upload is recent -- go figure
Speaking of these things, http://search.cpan.org/dist/perl-5.18.0/MANIFEST lists JSON/PP.pm but none of those cpan modules get a pod link -- seems like a similar root cause :)
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