Compliments on your prose, and I don't often compliment people's writing. It's clear and succinct ... I wish there were more technical writers like you.

• Wow. This is my first introduction to Perl6 polymorphism, and, just, wow.
• The focus understandably is on the languages that most associate with OO programming, such as C++, Java, Smalltalk. However, your audience may be mostly Perl5 hackers. Consider including some additional verbiage (not too much, but a few sentences here and there) tailored to engineers who will naturally want to compare polymorphism to the object model of Perl5.
• At the top of page 4, s/the return the return types/the return types/.
• It's hard to believe the symbol for British currency is really being proposed for the language. Being an ethnocentric American, I wouldn't even know where to find it on my keyboard. A truly horrendous design decision.

Hope this helps!

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