code: public static function init() : void
      {
          self::$classMap = new CallbackLazyMap(
              function ($className) {
                  $trimmedClassName = trim($className, '\\');
                  return $trimmedClassName === $className
                      ? new ObjectClass($className)
                      : ObjectClass::$classMap->$trimmedClassName;
              }
          );
      }
docs: Do not call from your code, workaround to initialize static variable.