I'm having some difficulty using avro-protobuf and I'm not sure what I'm doing wrong. I keep getting a ClassCastException that a Builder cannot be cast to a Message whenever I try to deserialize an object with the ProtobufDatumReader after it was serialized with the ProtobufDatumWriter. I've looked through the code a bit in ProtobufData and GenericDatumReader but I'm not sure how it's supposed to work because it appears to just be creating a new builder and then passing it to a method that attempts to cast it to a message. I've got a small example project here (https://bitbucket.org/willgorman/avro-proto-test) with a test that recreates the error. I've been able to do the same thing successfully using avro-thrift. Is there anything that I'm doing incorrectly here?
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