docs: public static <T> StreamObserver<T> asyncUnimplementedStreamingCall(
        MethodDescriptor<?, ?> methodDescriptor, StreamObserver<?> responseObserver) {
      // NB: For streaming call we want to do the same as for unary call. Fail-fast by setting error
      // on responseObserver and then return no-op observer.
      asyncUnimplementedUnaryCall(methodDescriptor, responseObserver);
      return new NoopStreamObserver<>();
    }