Does Perl 6 use $a and $b in sorting?

[email protected] (Parrot Raiser)
Newsgroups perl.perl6.language
Message-ID <CACwLAp9JR3sMLb2UA3rEdd3k7c95qOb8LQdaA=ooEhvYueFvsg@mail.gmail.com> 
Because of the the special significance of $a and $b in Perl 5's sort
comparison, I always avoid using the names in examples, lest it set a
booby-trap for later.

I've noticed "a" and "b' being used in some P6 examples. Are they no
longer significant, or are they just a poor choice of identifier?
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