Merge branch '3.4' into 4.2

* 3.4: (23 commits)
  fix cs
  Use mocks before replacing the error handler
  [Config] Do not use absolute path when computing the vendor freshness
  Bump minimum version of symfony/phpunit-bridge
  Container*::getServiceIds() should return an array of string
  [Config][ReflectionClassResource] Use ternary instead of null coaelscing operator
  [Validator] Add missing Russian and Ukrainian translations
  [Translation] Use HTTPS and fix a url
  [Config] Fix for signatures of typed properties
  [Validator] Add missing Hungarian translations
  [Validator] Add Lithuanian translation for Range validator
  Add HTTPS to a URL
  sync translation files
  PHPDoc fixes
  Add notInRange translation
  Add danish translation for Range validator
  Add german translation for Range validator
  Update validators.es.xlf
  [Validator] Add missing en and fr translation ids from 4.4
  [Debug][DebugClassLoader] Don't check class if the included file don't exist
  ...

Container.php

@@ -320,11 +320,11 @@ public function reset()
     /**
      * Gets all service ids.
      *
-     * @return array An array of all defined service ids
+     * @return string[] An array of all defined service ids
      */
     public function getServiceIds()
     {
-        return array_unique(array_merge(['service_container'], array_keys($this->fileMap), array_keys($this->methodMap), array_keys($this->services)));
+        return array_map('strval', array_unique(array_merge(['service_container'], array_keys($this->fileMap), array_keys($this->methodMap), array_keys($this->services))));
     }
 
     /**

ContainerBuilder.php

@@ -775,13 +775,11 @@ public function compile(bool $resolveEnvPlaceholders = false)
     }
 
     /**
-     * Gets all service ids.
-     *
-     * @return array An array of all defined service ids
+     * {@inheritdoc}
      */
     public function getServiceIds()
     {
-        return array_unique(array_merge(array_keys($this->getDefinitions()), array_keys($this->aliasDefinitions), parent::getServiceIds()));
+        return array_map('strval', array_unique(array_merge(array_keys($this->getDefinitions()), array_keys($this->aliasDefinitions), parent::getServiceIds())));
     }
 
     /**