docs: def as_dict(self):
          """
          Bson-serializable dict representation of the LightStructureEnvironments object.
          :return: Bson-serializable dict representation of the LightStructureEnvironments object.
          """
          return {"@module": self.__class__.__module__,
                  "@class": self.__class__.__name__,
                  "strategy": self.strategy.as_dict(),
                  "structure": self.structure.as_dict(),
                  "coordination_environments": self.coordination_environments,
                  "all_nbs_sites": [{'site': nb_site['site'].as_dict(),
                                     'index': nb_site['index'],
                                     'image_cell': [int(ii) for ii in nb_site['image_cell']]}
                                    for nb_site in self._all_nbs_sites],
                  "neighbors_sets": [[nb_set.as_dict() for nb_set in site_nb_sets] if site_nb_sets is not None else None
                                     for site_nb_sets in self.neighbors_sets],
                  "valences": self.valences}