in src/main/java/org/apache/sling/scripting/sightly/js/impl/rhino/JsValueAdapter.java [161:165]
private static Object tryKnownConversion(ScriptableObject object) {
String className = object.getClassName();
Class<?> cls = knownConversions.get(className);
return (cls == null) ? null : Context.jsToJava(object, cls);
}