In chapter "Classes and Objects", the "Inheritance" section uses Emplyee/Programmer/Cook/Baker/GeekCook as example.
The problem with is that it's pretty arbitrary, there doesn't seem to be an problem it actually solves. One doesn't know what behavior to expect from the classes, since there's no use case.
Instead a problem should be stated, to which a rather natural solution involves inheritance and polymorphism.
See also: http://lists.canonical.org/pipermail/kragen-tol/2011-August/000937.html
Perhaps we could steal Jonathan's travel agency example?
The docs have a TODO notice written right in the text: http://doc.perl6.org/language/classtut#Inheritance
That's not nice, especially given that this issue is from 2011.
The book is pretty much dead. Can we get this issue copied over to the doc site?