Merge branch '5.0'

* 5.0: (36 commits)
  Add test for tagged iterator with numeric index
  Fix container lint command when a synthetic service is used in combination with the expression language
  Fix Travis script
  [Validator][Range] Fix typos
  [SecurityBundle] Minor fix in LDAP config tree builder
  [HttpClient] fix requests to hosts that idn_to_ascii() cannot handle
  Revert "minor #35559 [FrameworkBundle] remove mention of the old Controller class (nicolas-grekas)"
  [FrameworkBundle] remove redundant PHPDoc in console Descriptor and subclass
  [Mime] remove phpdoc mentioning Utf8AddressEncoder
  Add missing phpdoc
  Remove int return type from FlattenException::getCode
  [Yaml] fix dumping strings containing CRs
  [DI] Fix XmlFileLoader bad error message
  [Form] Handle false as empty value on expanded choices
  [Messenger] Add ext-redis min version req to tests
  Tweak message
  improve PlaintextPasswordEncoder docBlock summary
  [Validator] Add two missing translations for the Arabic (ar) locale
  Use some PHP 5.4 constants unconditionally
  Add new packages on the link script
  ...

Author: nicolas-grekas

Test/HttpClientTestCase.php

@@ -703,6 +703,23 @@ public function testResolve()
         $client->request('GET', 'http://symfony.com:8057/', ['timeout' => 1]);
     }
 
+    public function testIdnResolve()
+    {
+        $client = $this->getHttpClient(__FUNCTION__);
+
+        $response = $client->request('GET', 'http://0-------------------------------------------------------------0.com:8057/', [
+            'resolve' => ['0-------------------------------------------------------------0.com' => '127.0.0.1'],
+        ]);
+
+        $this->assertSame(200, $response->getStatusCode());
+
+        $response = $client->request('GET', 'http://Bücher.example:8057/', [
+            'resolve' => ['xn--bcher-kva.example' => '127.0.0.1'],
+        ]);
+
+        $this->assertSame(200, $response->getStatusCode());
+    }
+
     public function testNotATimeout()
     {
         $client = $this->getHttpClient(__FUNCTION__);