The rewrite he included down the bottom from one of the Perl 6 developers is very readable, I might actually have a play with Perl 6 next time I get a moment.
It's certainly not as readable as the Haskell version, despite the claim to the contrary in the comments. But it's nice to see them supporting this style of programming.
Sure, but for anyone with any familiarity with that style (I know it from Erlang), it's immediately clear what it does.