static public function setNamespaces($nss)
	{
	    static::initNamespace();
	    
	    $nss = (array) $nss;
	    $rnss = [];
	    foreach ($nss as $ns => $path) {
	        if (!is_numeric($ns)) {
	            $ns = static::formatNamespace($ns);
	            static::loader()->setPsr4($ns, $path);
	        } else {
	            $ns = static::formatNamespace($path);
	        }
	        $rnss[] = $ns;
	    }
	    static::$namespaces = array_merge(static::$namespaces, $rnss);
	    return static::$namespaces = array_unique(static::$namespaces);
	}