Merge branch '4.2'

* 4.2:
  [Routing] fix trailing slash redirections involving a trailing var
  [EventDispatcher] Revers event tracing order
  [Security] Prefer clone over unserialize(serialize()) for user refreshment
  [Console] OutputFormatter: move strtolower to createStyleFromString
  Adjust tests to work in the armhf architecture. Fixes #29281.
  Vietnamese translations improvement
  [Form] Fixed FormErrorIterator class phpdoc
  Renamed test controller from Controller to TestController so it doesn't show up in the IDE autocomplete.
  Don't use he in docs when its not needed
  EventSubscriberInterface isn't a man
  Fix undefined variable in cache ArrayTrait
  fixed public directory of web server and assets install when configured in composer.json

Author: nicolas-grekas

Extension/Core/Type/ChoiceType.php

@@ -378,7 +378,7 @@ private function addSubForm(FormBuilderInterface $builder, string $name, ChoiceV
         if ($options['multiple']) {
             $choiceType = __NAMESPACE__.'\CheckboxType';
             // The user can check 0 or more checkboxes. If required
-            // is true, he is required to check all of them.
+            // is true, they are required to check all of them.
             $choiceOpts['required'] = false;
         } else {
             $choiceType = __NAMESPACE__.'\RadioType';

FormErrorIterator.php

@@ -19,10 +19,9 @@
 /**
  * Iterates over the errors of a form.
  *
- * Optionally, this class supports recursive iteration. In order to iterate
- * recursively, set the constructor argument $deep to true. Now each element
- * returned by the iterator is either an instance of {@link FormError} or of
- * {@link FormErrorIterator}, in case the errors belong to a sub-form.
+ * This class supports recursive iteration. In order to iterate recursively,
+ * pass a structure of {@link FormError} and {@link FormErrorIterator} objects
+ * to the $errors constructor argument.
  *
  * You can also wrap the iterator into a {@link \RecursiveIteratorIterator} to
  * flatten the recursive structure into a flat list of errors.