# The meta-object representing the dynamic type of `self`.
	#
	# Specific meta-object can be used in subclasses
	# by redefining `CLASS` and `class_factory`.
	fun get_class: CLASS do
		var class_pool = once new HashMap[String, Class[Object]]
		var name = class_name
		var res = class_pool.get_or_null(name)
		if res != null then return res.as(CLASS)
		res = class_factory(name)
		assert res.name == name
		class_pool[name] = res
		return res
	end