docs: def to_cls(self):
          """Property to retrieve to_cls as an entity when possible"""
          # Checks if ``to_cls`` is a string
          #   If it is, checks if the entity is imported and available
          #   If it is, register the class
          try:
              if isinstance(self._to_cls, str):
                  self._to_cls = fetch_entity_cls_from_registry(self._to_cls)
          except AssertionError:
              # Preserve ``to_cls`` as a string and we will hook up the entity later
              pass
  
          return self._to_cls