I want to make a Ruby client. In my service_pb.rb file I have:
```
add_message 'request' do
...
optional :test, :message, 12, 'google.protobuf.Struct'
end```
Now I am trying to pass the request params in my client.rb:
```
params = {xyz: "abc", test: { bar: "296" }}
stub = Message::Stub.new('localhost:9999', :this_channel_is_insecure)
msg = Request.new(params)
```
while running this I am getting: ArgumentError: Unknown field name 'bar' in
initialization map entry.
I need to pass a Hash object in request params.
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