docs: def anonymous(self):
          """
          Gets the anonymous handler. Also tries to grab a class
          if the `anonymous` value is a string, so that we can define
          anonymous handlers that aren't defined yet (like, when
          you're subclassing your basehandler into an anonymous one.)
          """
          if hasattr(self.handler, 'anonymous'):
              anon = self.handler.anonymous
  
              if callable(anon):
                  return anon
  
              for klass in typemapper.keys():
                  if anon == klass.__name__:
                      return klass
  
          return None