@Override
  public <CT, VT extends CT> PdxInstanceFactory writeField(String fieldName, VT fieldValue,
      Class<CT> fieldType) {
    return writeField(fieldName, fieldValue, fieldType, false);
  }
PdxInstances created with this factory can never be deserialized but you can access their fields
just like any other pdx.
<p>
The current implementation of this interface is meant for internal use only. The way it defines a
PdxType is expensive since it can never figure out it is already defined without doing an
expensive check in the type registry. We should optimize this before making this a public
feature.
geode-core/src/main/java/org/apache/geode/pdx/internal/PdxInstanceFactoryImpl.java