# Return a instance associated to a primitive class
	# Current primitive classes are `Int`, `Bool`, and `String`
	fun value_instance(object: Object): Instance
	do
		if object isa Int then
			return int_instance(object)
		else if object isa Bool then
			return bool_instance(object)
		else if object isa String then
			return string_instance(object)
		else
			abort
		end
	end