Can't serialize NaN about gson-fire HOT 11 CLOSED

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;

import io.gsonfire.GsonFireBuilder;
import io.gsonfire.PostProcessor;
import io.gsonfire.TypeSelector;

public class GsonFireBug {
	
	private static class GSONAdapter implements PostProcessor<Object>, TypeSelector<Object> {

	    private static final String CLASSNAME = "$type";

		@Override
		public void postDeserialize(Object result, JsonElement src, Gson gson) { }

		/**
		 * After serializing, we add the name of the class to the JsonElement if it represent a class.
		 */
		@Override
		public void postSerialize(JsonElement result, Object src, Gson gson) {
//			if (result.isJsonObject())
//				result.getAsJsonObject().addProperty(CLASSNAME, src.getClass().getName());
		}

		/**
		 * If the element is a JsonObject, then expect the {@link #CLASSNAME} field to specify the name of the class to use.
		 */
		@Override
		public Class<? extends Object> getClassForElement(JsonElement readElement) {
//			if (readElement.isJsonObject()) {
//				String className = readElement.getAsJsonObject().get(CLASSNAME).toString();
//				className = className.replaceAll("\"", "");
//				try {
//					return Class.forName(className);
//				} catch (ClassNotFoundException e) {
//					throw new IllegalArgumentException("Could not load class " + className, e);
//				}
//			}
			return null;	// Else use the default.
		}

	}

	public static Gson getGson(boolean triggerBug) {
		GsonFireBuilder builder = new GsonFireBuilder();
		GSONAdapter adapter = new GSONAdapter();
		if (triggerBug) {
			builder.registerPostProcessor(Object.class, adapter);
			builder.registerTypeSelector(Object.class, adapter);
		}
		GsonBuilder gb = builder.createGsonBuilder();
		gb.serializeSpecialFloatingPointValues();
		Gson gson = gb.create();
		return gson;
	}

	public static class Buggy {
		double a = Double.NaN;
	}

	public static void main(String[] args) {
		String json;
		Buggy fm = new Buggy(); 

		json = getGson(false).toJson(fm);	// Succeeds
		System.out.println(json);

		json = getGson(true).toJson(fm);	// Fails 
		System.out.println(json);
	}	
}