Merge branch '4.4'

* 4.4: (26 commits)
  cs fix
  [Validator] sync NO and NB translations
  [Cache] improve perf of pruning for fs-based adapters
  [Cache] cs fix
  [Cache] clean tags folder on invalidation
  [Cache] remove implicit dependency on symfony/filesystem
  Allow to set cookie_samesite to 'none'
  [Dotenv] support setting default env var values
  [VarDumper] fix array key error for class SymfonyCaster
  [Cache] Improve RedisTagAwareAdapter invalidation logic & requirements
  Adds missing translations for no nb
  [HttpKernel] fix $dotenvVars in data collector
  Add the missing translations for the Swedish ("sv") locale
  Prevent ProgressBar redraw when message is same
  [DI] enable improved syntax for defining method calls in Yaml
  bumped Symfony version to 4.3.6
  updated VERSION for 4.3.5
  updated CHANGELOG for 4.3.5
  bumped Symfony version to 3.4.33
  updated VERSION for 3.4.32
  ...

Author: nicolas-grekas

Caster/SymfonyCaster.php

@@ -33,7 +33,8 @@ public static function castRequest(Request $request, array $a, Stub $stub, bool
         $clone = null;
 
         foreach (self::$requestGetters as $prop => $getter) {
-            if (null === $a[Caster::PREFIX_PROTECTED.$prop]) {
+            $key = Caster::PREFIX_PROTECTED.$prop;
+            if (\array_key_exists($key, $a) && null === $a[$key]) {
                 if (null === $clone) {
                     $clone = clone $request;
                 }
@@ -47,7 +48,9 @@ public static function castRequest(Request $request, array $a, Stub $stub, bool
     public static function castHttpClient($client, array $a, Stub $stub, bool $isNested)
     {
         $multiKey = sprintf("\0%s\0multi", \get_class($client));
-        $a[$multiKey] = new CutStub($a[$multiKey]);
+        if (isset($a[$multiKey])) {
+            $a[$multiKey] = new CutStub($a[$multiKey]);
+        }
 
         return $a;
     }