docs: public static <T> void mergeFrom(InputStream in, T message, Schema<T> schema,
              LinkedBuffer buffer) throws IOException
      {
          final CodedInput input = new CodedInput(in, buffer.buffer, true);
          final GraphCodedInput graphInput = new GraphCodedInput(input);
          schema.mergeFrom(graphInput, message);
          input.checkLastTagWas(0);
      }