The IRC :: Client code is quite old (look at the latest commits), and it is likely that it simply won’t work with the current Rakudo. You can try the old alpha branch, if you really want to try, there is a lot of old Perl 6 code that works well on it.
About IO :: Socket :: INET, I really do not think this is incomplete or something else, the case that you showed concerns IRC :: Client directly. And, as I said, Rakudo and even Perl 6 are still evolving, and it is possible that something has changed around them.
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