def __new__(cls, name='Default', defaults=None):
    """
        Class constructor.
        :param name: instance name id.
        :param defaults: dafault values dict or None.
        :return: an instance of the config object.
        """
    if name not in cls.__registry__:
        cls.__registry__[name] = dict.__new__(cls)
    return cls.__registry__[name]
