code: protected void writeBareObject (Object obj, Streamer streamer, boolean useWriter)
          throws IOException
      {
          _current = obj;
          _streamer = streamer;
          try {
              _streamer.writeObject(obj, this, useWriter);
          } finally {
              _current = null;
              _streamer = null;
          }
      }
docs: Write a {@link Streamable} instance without associated class metadata.