In protobuf-net how do i deserialize an unknown type?

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Deserialize unknown type with protobuf-net

In protobuf-net, how do I deserialize an unknown type?

Off the wire, I get a byte array but I don't know the type yet.

I was hoping to return object and test with Object MyType but the below doesn't work.

object obj = Serializer.Deserialize<object>(new MemoryStream(cellUpdate.Payload));