Method deserialize

src/marshmallow/fields.py:344–350

(
        self,
        value: None,
        attr: str | None = None,
        data: typing.Mapping[str, typing.Any] | None = None,
        **kwargs,
    )

    # If value is None, None may be returned
    @typing.overload
    def deserialize(
        self,
        value: None,
        attr: str | None = None,
        data: typing.Mapping[str, typing.Any] | None = None,
        **kwargs,
    ) -> None | _InternalT: ...

    # If value is not None, internal type is returned
    @typing.overload