private void swizzleGemFireClassNames() {
    OldClientSupportService svc = InternalDataSerializer.getOldClientSupportService();
    if (svc != null) {
      className = svc.processIncomingClassName(className);
    }
  }
A count of the total number of variable length field offsets.
geode-core/src/main/java/org/apache/geode/pdx/internal/PdxType.java