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Add language Raku (Perl 6)
I'm not much of an advocate, but I think there are good reasons for inclusion. First, it's not similar to any of the supported languages. Raku's only common thing with PERL is the community - that's an exaggeration, but not by much. There are some syntactic and semantic similarities, but they're of "spiritual successor" level at most. Second, Raku includes a breadth of language features that is unmatched by anything, save for maybe Oz or Racket (if taken to the extreme with all the #langs available as packages). Despite this, it manages to stay practical, which is nice, but more importantly, its idiomatic ways of doing things are very often completely unlike that of any other language. In other words, including Raku will directly make PI more interesting to read :)
There's a FAQ entry with a list of interesting features of the language: link
To be fair: the community is dedicated but not very large. You'll find that some things from language spec are not yet implemented or, sometimes, implemented but not optimized enough to be of actual use. The "batteries included" stdlib has a few batteries missing, and the number of community packages is obviously way lower than in Python or JS ecosystems. Some things are still being designed, for example, syntactic macros. Some others are rough around the edges or un(der)documented, like the nqp IR-like thing in the Rakudo compiler. All this is normal for younger languages, though, including the big ones in their youth.
In any case: my vote is in favor of Raku on this if that's worth anything :)
