clone_attribute_value

# File activerecord/lib/active_record/base.rb, line 2161
      def clone_attribute_value(reader_method, attribute_name)
        value = send(reader_method, attribute_name)

        case value
        when nil, Fixnum, true, false
          value
        else
          value.clone
        end
      rescue TypeError, NoMethodError
        value
      end