public void addObjPartNoCopying(Object o) {
    if (o == null || o instanceof byte[]) {
      addRawPart((byte[]) o, false);
    } else {
      serializeAndAddPartNoCopying(o);
    }
  }
Like addObjPart(Object) but also prefers to reference objects in the part instead of copying
them into a byte buffer.
geode-core/src/main/java/org/apache/geode/internal/cache/tier/sockets/Message.java