def have_attributes(attr, *more)
      sum = (more << attr)
      sum.each do |name|
        raise ArgumentError, "Reserved attribute name #{name}" if @verbotten.include?(name)
      end
      @attributes += sum
    end
def have_attributes(attr, *more)
      sum = (more << attr)
      sum.each do |name|
        raise ArgumentError, "Reserved attribute name #{name}" if @verbotten.include?(name)
      end
      @attributes += sum
    end
Specify symbols that will later be reified into attributes