Merge branch '5.1'

* 5.1: (28 commits)
  [DI] fix
  Use "composer/package-versions-deprecated" when possible
  Fix
  Small update in our internal terminology
  Fix support for PHP8 union types
  [VarDumper] fix typo
  [Lock][Messenger] Fix precedence of DSN options for 5.1
  Fix support for PHP8 union types
  [FrameworkBundle] preserve dots in query-string when redirecting
  [3.4] Fix support for PHP8 union types
  [PhpUnitBridge] Streamline ansi/no-ansi of composer according to phpunit --colors option
  [3.4] Small update in our internal terminology
  [Cache] fix compat with DBAL v3
  Remove unnecessary null check
  [HttpFoundation] Allow `null` in InputBag@set
  [HttpClient] Convert CurlHttpClient::handlePush() to instance method
  Fix package rename when releasing
  bumped Symfony version to 5.1.3
  updated VERSION for 5.1.2
  updated CHANGELOG for 5.1.2
  ...

Author: nicolas-grekas

OptionsResolver.php

@@ -206,7 +206,7 @@ public function setDefault(string $option, $value)
                 return $this;
             }
 
-            if (isset($params[0]) && null !== ($type = $params[0]->getType()) && self::class === $type->getName() && (!isset($params[1]) || (null !== ($type = $params[1]->getType()) && Options::class === $type->getName()))) {
+            if (isset($params[0]) && null !== ($type = $params[0]->getType()) && self::class === $type->getName() && (!isset($params[1]) || (($type = $params[1]->getType()) instanceof \ReflectionNamedType && Options::class === $type->getName()))) {
                 // Store closure for later evaluation
                 $this->nested[$option][] = $value;
                 $this->defaults[$option] = [];
@@ -1283,7 +1283,7 @@ private function formatOptions(array $options): string
 
     private function getParameterClassName(\ReflectionParameter $parameter): ?string
     {
-        if (!($type = $parameter->getType()) || $type->isBuiltin()) {
+        if (!($type = $parameter->getType()) instanceof \ReflectionNamedType || $type->isBuiltin()) {
             return null;
         }