docs: def get(self, key):
          """ Executes the callable registered at the specified key and returns
              its value along with type info. Subsequent queries are cached
              internally.
  
              `key`
                  String key for a previously stored callable.
              """
  
          obj = super(ExtRegistry, self).get(key)
          if obj is None:
              return obj
  
          return (obj, self._type_info.get(key))