Merge branch '5.3' into 5.4

* 5.3:
  [Security] Do not overwrite already stored tokens for REMOTE_USER authentication
  [Validator] Fix validation for single level domains
  Fix redundant type casts
  Increased the reserved memory from 10k to 32k
  [DoctrineBridge] Add DbalLoggerTest to group legacy
  Leverage DBAL's getNativeConnection() method
  Fix idempotency of LocoProvider write method

Author: nicolas-grekas

AbstractRendererEngine.php

@@ -68,7 +68,7 @@ public function setTheme(FormView $view, $themes, bool $useDefaultThemes = true)
 
         // Do not cast, as casting turns objects into arrays of properties
         $this->themes[$cacheKey] = \is_array($themes) ? $themes : [$themes];
-        $this->useDefaultThemes[$cacheKey] = (bool) $useDefaultThemes;
+        $this->useDefaultThemes[$cacheKey] = $useDefaultThemes;
 
         // Unset instead of resetting to an empty array, in order to allow
         // implementations (like TwigRendererEngine) to check whether $cacheKey

FormFactory.php

@@ -66,7 +66,7 @@ public function createNamedBuilder(string $name, string $type = FormType::class,
 
         $type = $this->registry->getType($type);
 
-        $builder = $type->createBuilder($this, (string) $name, $options);
+        $builder = $type->createBuilder($this, $name, $options);
 
         // Explicitly call buildForm() in order to be able to override either
         // createBuilder() or buildForm() in the resolved form type