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support msgpack.packb kwargs #380

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The main reason for submitting this PR is to give users the ability to subclass RedisChannelLayer and do sth like:

def default(value):
    if isinstance(value, enum.Enum):
        return value.value
    return value


class ECRedisChannelLayer(RedisChannelLayer):
    """EC stands for "enum-compatible" """
    def _packing_kwargs(self, message):
        return {**super()._packing_kwargs, 'default': default}

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Could you add a test case showing the usage here?

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