def new_attribute(name, type)
      attributes[name] = type
      define_attr_reader(name)
      define_attr_writer(name, type)
      name
    end
def new_attribute(name, type)
      attributes[name] = type
      define_attr_reader(name)
      define_attr_writer(name, type)
      name
    end
Add new attribute for the tiny object modeled

 @param [Symbol] name the attribute name
 @param [Class] type the class type

 @private