code: public function get($id, $invalidBehavior = ContainerInterface::EXCEPTION_ON_INVALID_REFERENCE)
      {
          if (!$this->booted) {
              $this->boot();
          }
  
          return $this->container->get($id, $invalidBehavior);
      }
docs: Gets a service from the service container.
  
  @param string $id              The service identifier
  @param int    $invalidBehavior The behavior when the service does not exist
  
  @return object The associated service