Merge branch '4.2'

* 4.2: (26 commits)
  Apply php-cs-fixer rule for array_key_exists()
  [Cache] fix warming up cache.system and apcu
  [Security] Change FormAuthenticator if condition
  handles multi-byte characters in autocomplete
  speed up tests running them without debug flag
  [Translations] added missing Croatian validators
  Fix getItems() performance issue with RedisCluster (php-redis)
  [VarDumper] Keep a ref to objects to ensure their handle cannot be reused while cloning
  IntegerType: reject submitted non-integer numbers
  be keen to newcomers
  [HttpKernel] Fix possible infinite loop of exceptions
  fixed CS
  [Validator] Added missing translations for Afrikaans
  do not validate non-submitted form fields in PATCH requests
  Update usage example in ArrayInput doc block.
  [Console] Prevent ArgvInput::getFirstArgument() from returning an option value
  [Validator] Fixed duplicate UUID
  fixed CS
  [EventDispatcher] Fix unknown priority
  Avoid mutating the Finder when building the iterator
  ...

Author: nicolas-grekas

Handler/FingersCrossed/HttpCodeActivationStrategy.php

@@ -31,10 +31,10 @@ class HttpCodeActivationStrategy extends ErrorLevelActivationStrategy
     public function __construct(RequestStack $requestStack, array $exclusions, $actionLevel)
     {
         foreach ($exclusions as $exclusion) {
-            if (!array_key_exists('code', $exclusion)) {
+            if (!\array_key_exists('code', $exclusion)) {
                 throw new \LogicException(sprintf('An exclusion must have a "code" key'));
             }
-            if (!array_key_exists('urls', $exclusion)) {
+            if (!\array_key_exists('urls', $exclusion)) {
                 throw new \LogicException(sprintf('An exclusion must have a "urls" key'));
             }
         }