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An object that can be turned into JSON dictionaries.
The magic method _jsondict must return a trivially json-serializable type or other objects that support the SupportsJSON protocol.
During deserialization, a class must be able to be resolved (see
the docstring for
read_json) and must be able to be (re-)constructed
from the serialized parameters. If the type defines a classmethod
_from_json_dict_, that will be called. Otherwise, the
will be popped from the dictionary and used as kwargs to the type's
_json_dict_() -> Union[None, NotImplementedType, Dict[Any, Any]]