Hmm... If you let me google that for you, "perl 6" munch, I find Perl 6 documentation on the first page of hits and again on the second page. Unfortunately, it looks like both of those mention/use .munch rather than documenting it.
But it also found http://irclog.perlgeek.de/perl6/2010-06-04 where TimToady discusses .munch. #i_2403514 appears to be where .munch was invented... less than 4 months ago.
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