.boolean? method for ruby objects

gistfile1.rb

module RubyExt
  module Boolean
    module ClassMethods
      def boolean?
        ["TrueClass", "FalseClass"].include?(self.name)
      end
    end

    module InstanceMethods
      def boolean?
        self.class.boolean?
      end
    end

    def self.included(receiver)
      receiver.extend         ClassMethods
      receiver.send :include, InstanceMethods
    end
  end  
end

::Object.__send__ :include, RubyExt::Boolean

Já precisei (e implementei) de algo parecido: de ter um método to_bool que existisse desde a classe Object.