new ClientDuplexStream(call, serialize, deserialize)
    A stream that the client can read from or write to. Used for calls with
duplex streaming.
    Parameters:
| Name | Type | Description | 
|---|---|---|
| call | grpc.Call | Call object to proxy | 
| serialize | function | Serialization function for requests | 
| deserialize | function | Deserialization function for responses | 
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