Merge branch '4.4' into 5.0

* 4.4: (34 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
  [Validator][Range] Fix typos
  [SecurityBundle] Minor fix in LDAP config tree builder
  [HttpClient] fix requests to hosts that idn_to_ascii() cannot handle
  [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
  [DI] fix dumping errored definitions
  [DI] ignore extra tags added by autoconfiguration in PriorityTaggedServiceTrait
  ...

Author: nicolas-grekas

HttpClientTrait.php

@@ -441,10 +441,7 @@ private static function parseUrl(string $url, array $query = [], array $allowedS
                 throw new InvalidArgumentException(sprintf('Unsupported IDN "%s", try enabling the "intl" PHP extension or running "composer require symfony/polyfill-intl-idn".', $host));
             }
 
-            if (false === $host = \defined('INTL_IDNA_VARIANT_UTS46') ? idn_to_ascii($host, IDNA_DEFAULT, INTL_IDNA_VARIANT_UTS46) : strtolower($host)) {
-                throw new InvalidArgumentException(sprintf('Unsupported host in "%s".', $url));
-            }
-
+            $host = \defined('INTL_IDNA_VARIANT_UTS46') ? idn_to_ascii($host, IDNA_DEFAULT, INTL_IDNA_VARIANT_UTS46) ?: strtolower($host) : strtolower($host);
             $host .= $port ? ':'.$port : '';
         }