code: def _default(self, obj: object):
          
          return None if obj is JSGNull else obj.val if type(obj) is AnyType else \
              JSGObject._strip_nones(obj.__dict__) if isinstance(obj, JsonObj) \
              else cast(JSGString, obj).val if issubclass(type(obj), JSGString) else str(obj)
docs: Return a serializable version of obj. Overrides JsonObj _default method
          :param obj: Object to be serialized
          :return: Serialized version of obj