Merge branch '4.2' into 4.3

* 4.2:
  Fix Twig 1.x compatibility
  [Translator] Improve farsi(persian) translations for Form
  Improve fa translations
  Added tests to cover the possibility of having scalars as services.
  fixed tests on old PHP versions
  [FrameworkBundle] Inform the user when save_path will be ignored
  fixed CS
  [Translator] Load plurals from po files properly
  [Serializer]: AbstractObjectNormalizer ignores the property types of discriminated classes
  [EventDispatcher] Add tag kernel.rest on 'debug.event_dispatcher' service
  [Console] Update to inherit and add licence
  [Intl] Remove --dev from intl compile autoloader
  Remove call to deprecated method
  [Intl] Init compile tmp volume
  PHP 5 compat
  Add test case
  Update Request.php
  Don't assume port 0 for X-Forwarded-Port
  Load plurals from mo files properly

DependencyInjection/MessengerPass.php

@@ -221,7 +221,7 @@ private function guessHandledClasses(\ReflectionClass $handlerClass, string $ser
             throw new RuntimeException(sprintf('Invalid handler service "%s": type-hint of argument "$%s" in method "%s::__invoke()" must be a class , "%s" given.', $serviceId, $parameters[0]->getName(), $handlerClass->getName(), $type));
         }
 
-        return [(string) $parameters[0]->getType()];
+        return [$parameters[0]->getType()->getName()];
     }
 
     private function registerReceivers(ContainerBuilder $container, array $busIds)