docs: def merge(self, *args):
          """
          Merges this instance with new instances, in-place.
  
          :param \\*args: Configuration values to merge with current instance.
          :type \\*args: iterable
  
          """
          for data in args:
              if isinstance(data, str):
                  to_merge = load_string(data, self.context)
                  if not to_merge:
                      continue
              else:
                  to_merge = data
  
              if not self.can_merge(to_merge):
                  raise TypeError(
                      'Cannot merge myself:%s with %s. data: %s' \
                      % (type(self), type(data), data)
                  )
  
              self._merge(to_merge)