Mixin hierarchy in Ruby 1.9 in Ruby 1.9 where I(x) and (x) are in RHG notation. it means, * I(x) is an incarnation class of the module x. * (x) is an eigenclass of object x. source: module Inteligence; end module Prayable include Inteligence end class Cattle; end class Yapoo < Cattle include Prayable end class Pegasus < Cattle include Inteligence end Done
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