private static boolean writeWellKnownObject(Object o, DataOutput out,
      boolean ensurePdxCompatibility) throws IOException {
    return writeUserObject(o, out, ensurePdxCompatibility);
  }
Data serializes an instance of a well-known class to the given {@code DataOutput}.

@return {@code true} if {@code o} was actually written to {@code out}
geode-core/src/main/java/org/apache/geode/internal/InternalDataSerializer.java