code: def merge(self, other, replacements=None):
          
  
          # TODO: is the current solution not optimal enough?
          for _, item in other._storage.items():  # type: RegionObject
              for so in item.stored_objects:  # type: StoredObject
                  if replacements and so.obj in replacements:
                      so = StoredObject(so.start, replacements[so.obj], so.size)
                  self._object_mapping[so.obj_id] = so
                  self.__store(so, overwrite=False)
  
          return self
docs: Merge another KeyedRegion into this KeyedRegion.
  
          :param KeyedRegion other: The other instance to merge with.
          :return: None