code: def include(*what):
      
      cls, attrs = _split_what(what)
  
      def include_(attribute, value):
          return value.__class__ in cls or attribute in attrs
  
      return include_
docs: Whitelist *what*.
  
      :param what: What to whitelist.
      :type what: :class:`list` of :class:`type` or :class:`attr.Attribute`\\ s
  
      :rtype: :class:`callable`