public static function soft_delete_property($key, $default = null)
	{
		$class = get_called_class();

		// If already determined
		if (! array_key_exists($class, static::$_soft_delete_cached))
		{
			static::soft_delete_properties();
		}

		return \Arr::get(static::$_soft_delete_cached[$class], $key, $default);
	}