def __init__(self):
        self._registry = {}
        self._ddp_subscribers = {}
replaces the related references with Base representation
dataset/ETHPy150Open django-ddp/django-ddp/dddp/api.py/DDP.__init__--crossover with--dataset/ETHPy150Open eoyilmaz/anima/anima/env/mayaEnv/toolbox.py/Reference.to_base