I'm passing data from my extended admin controller to my extended datawriter using XenForo_Application::set() in the controller and XenForo_Application::get() in the datawriter. The problem I'm running into is that if XenForo_Application::set() is called with a 0 or even a '0' for the value, it doesn't actually get set. IE, XenForo_Application::set('testing', 0); doesn't work. If I call that and then later call XenForo_Application::isRegistered('testing')), I get a false returned instead of a true. So my questions are: 1. Is there a better way to pass data into the datawriter from an extended controller? 2. Assuming this is the best way, how do I go about sending a 0 to the datawriter? In case the font makes it unclear, I'm talking about zero here, not O/o/Oh I know that I could just initialize the datawriter in my extended controller and save my values there instead of trying to set them in the controller and retrieve in the datawriter, but that results in an extra insert. If that's the recommended way of inserting this data, I'll go with it, but I'm hoping there's an easy way to utilize the _preSave() method in the datawriter so that I don't have two inserts.