protected static function _cleanKey( $key, $opposite = true )
    {
        if ( !static::$_neutralizeKeys )
        {
            $_cleaned = $key;
        }
        elseif ( $key == ( $_cleaned = Inflector::neutralize( $key ) ) )
        {
            if ( $opposite )
            {
                return Inflector::deneutralize( $key, true );
            }
        }

        return $_cleaned;
    }