src/main/java/com/googlecode/objectify/impl/translate/ClassTranslator.java
public void registerSubclass(ClassTranslator<? extends P> translator) {
		byDiscriminator.put(translator.getDiscriminator(), translator);

		Subclass sub = translator.getDeclaredClass().getAnnotation(Subclass.class);
		for (String alsoLoad: sub.alsoLoad())
			byDiscriminator.put(alsoLoad, translator);

		byClass.put(translator.getDeclaredClass(), translator);
	}
public void registerSubclass(ClassTranslator<? extends P> translator) {
		byDiscriminator.put(translator.getDiscriminator(), translator);

		Subclass sub = translator.getDeclaredClass().getAnnotation(Subclass.class);
		for (String alsoLoad: sub.alsoLoad())
			byDiscriminator.put(alsoLoad, translator);

		byClass.put(translator.getDeclaredClass(), translator);
	}
Register a subclass translator with this class translator. That way if we get called upon
to translate an instance of the subclass, we will forward to the correct translator.