Merge branch '4.1' into 4.2

* 4.1:
  Fix typos in doc blocks
  [Debug] ignore underscore vs backslash namespaces in DebugClassLoader
  [TwigBridge][Form] Prevent multiple rendering of form collection prototypes
  [FrameworkBundle] fix describing routes with no controllers
  [DI] move RegisterServiceSubscribersPass before DecoratorServicePass
  Update ValidationListener.php
  [Yaml] ensures that the mb_internal_encoding is reset to its initial value
  [WebLink] Fixed documentation link
  [Security] getTargetPath of TargetPathTrait must return string or null
  [Hackday][Serializer] Deserialization ignores argument type hint from phpdoc for array in constructor argument
  Optimize perf by replacing call_user_func with dynamic vars
  [Routing] fix dumping same-path routes with placeholders
  [Security] defer log message in guard authenticator
  [Validator] Added IBAN format for Vatican City State
  merge conflicts
  filter out invalid Intl values
  filter out invalid language values
  [Validator] Fixed grouped composite constraints
  [Form] Filter arrays out of scalar form types
  Fix HeaderBag::get phpdoc

Author: nicolas-grekas

Command/Command.php

@@ -250,7 +250,7 @@ public function run(InputInterface $input, OutputInterface $output)
         $input->validate();
 
         if ($this->code) {
-            $statusCode = \call_user_func($this->code, $input, $output);
+            $statusCode = ($this->code)($input, $output);
         } else {
             $statusCode = $this->execute($input, $output);
         }

Helper/ProcessHelper.php

@@ -136,7 +136,7 @@ public function wrapCallback(OutputInterface $output, Process $process, callable
             $output->write($formatter->progress(spl_object_hash($process), $this->escapeString($buffer), Process::ERR === $type));
 
             if (null !== $callback) {
-                \call_user_func($callback, $type, $buffer);
+                $callback($type, $buffer);
             }
         };
     }

Helper/ProgressBar.php

@@ -496,7 +496,7 @@ private function buildLine(): string
         $regex = "{%([a-z\-_]+)(?:\:([^%]+))?%}i";
         $callback = function ($matches) {
             if ($formatter = $this::getPlaceholderFormatterDefinition($matches[1])) {
-                $text = \call_user_func($formatter, $this, $this->output);
+                $text = $formatter($this, $this->output);
             } elseif (isset($this->messages[$matches[1]])) {
                 $text = $this->messages[$matches[1]];
             } else {

Helper/ProgressIndicator.php

@@ -196,7 +196,7 @@ private function display()
 
         $this->overwrite(preg_replace_callback("{%([a-z\-_]+)(?:\:([^%]+))?%}i", function ($matches) use ($self) {
             if ($formatter = $self::getPlaceholderFormatterDefinition($matches[1])) {
-                return \call_user_func($formatter, $self);
+                return $formatter($self);
             }
 
             return $matches[0];

Helper/QuestionHelper.php

@@ -381,7 +381,7 @@ private function validateAttempts(callable $interviewer, OutputInterface $output
             }
 
             try {
-                return \call_user_func($question->getValidator(), $interviewer());
+                return $question->getValidator()($interviewer());
             } catch (RuntimeException $e) {
                 throw $e;
             } catch (\Exception $error) {