Base class for objects that can be serialized to and from JSON.

SerializableObjectJson defines the interface for custom objects that need to be stored in RFields. Objects must implement both serialize and deserialize methods to convert between Python objects and JSON-compatible representations.

This is useful when: - You need custom serialization logic not covered by Pydantic - You want fine-grained control over the serialization format - You're working with complex objects that need special handling - You want to maintain backward compatibility with existing formats

The serialization must produce JSON-compatible types (dict, list, str, bool, float, int, None), which can be stored and later deserialized back to the original object.

Example: ```python class Point(SerializableObjectJson): def init(self, x: float, y: float): self.x = x self.y = y

    def serialize(self) -> Dict:
        return {'x': self.x, 'y': self.y}

    @classmethod
    def deserialize(cls, data: Dict) -> 'Point':
        return cls(x=data['x'], y=data['y'])

class MyResource(Resource):
    location = SerializableRField(object_type=Point)
```