Class library snippet

Class = (function(class) return finalize_object(class, class) end)(
    class_from_constructor(function(name_or_constructor)
        if type(name_or_constructor) == 'string' then
            return NamedClass(name_or_constructor)
        end
        if type(name_or_constructor) == 'table' then
            name_or_constructor = nil
        end
        return class_from_constructor(name_or_constructor)
    end)
)

NamedClass = Class(named_class_constructor_from_name)

Class 'Class' (Class)
Class 'NamedClass' (NamedClass)