Merge branch '4.4' into 5.1

* 4.4:
  [HttpFoundation] Drop int return type from parseFilesize()
  Added $translator->addLoader()
  bug symfony/symfony#39878 [doctrine-bridge] Add username to UserNameNotFoundException
  fix spelling
  Add check for constant in Curl client
  Revert #38614, add assert to avoid regression
  Fix problem when SYMFONY_PHPUNIT_VERSION is empty string value
  Update PHP CS Fixer config to v2.18

Author: derrabus

Extension/Core/Type/FileType.php

@@ -171,8 +171,10 @@ private function getFileUploadError(int $errorCode)
      * Returns the maximum size of an uploaded file as configured in php.ini.
      *
      * This method should be kept in sync with Symfony\Component\HttpFoundation\File\UploadedFile::getMaxFilesize().
+     *
+     * @return int|float The maximum size of an uploaded file in bytes (returns float if size > PHP_INT_MAX)
      */
-    private static function getMaxFilesize(): int
+    private static function getMaxFilesize()
     {
         $iniMax = strtolower(ini_get('upload_max_filesize'));
 
@@ -207,8 +209,10 @@ private static function getMaxFilesize(): int
      * (i.e. try "MB", then "kB", then "bytes").
      *
      * This method should be kept in sync with Symfony\Component\Validator\Constraints\FileValidator::factorizeSizes().
+     *
+     * @param int|float $limit
      */
-    private function factorizeSizes(int $size, int $limit)
+    private function factorizeSizes(int $size, $limit)
     {
         $coef = self::MIB_BYTES;
         $coefFactor = self::KIB_BYTES;