Merge branch '3.3' into 3.4

* 3.3: (27 commits)
  Always require symfony/polyfill-apcu to provide APCuIterator everywhere
  bumped Symfony version to 3.3.9
  updated VERSION for 3.3.8
  updated CHANGELOG for 3.3.8
  [DI] Fix tracking env var placeholders nested in object graphs
  bumped Symfony version to 3.3.8
  updated VERSION for 3.3.7
  updated CHANGELOG for 3.3.7
  [DI] Fix tracking env vars when merging configs (bis)
  removed obsolete comment
  install PHPUnit 6 on PHP 7.2
  [Cache] Use zend.detect_unicode instead of zend.multibyte
  Fix case sensitive typo in use class name
  [VarDumper] Enhance docblock to tell about AbstractDumper::dumpLine(-1)
  [Debug] Remove false-positive check in DebugClassLoader
  [Validator] Fix use of GroupSequenceProvider in child classes
  Change number PHPDoc type to int|float
  [Cache] Workaround zend.detect_unicode + zend.multibyte
  [VarDumper] Strengthen dumped JS
  [VarDumper] Strengthen dumped JS
  ...

Author: fabpot

NumberFormatter/NumberFormatter.php

@@ -357,9 +357,9 @@ public function formatCurrency($value, $currency)
     /**
      * Format a number.
      *
-     * @param number $value The value to format
-     * @param int    $type  Type of the formatting, one of the format type constants
-     *                      Only type NumberFormatter::TYPE_DEFAULT is currently supported.
+     * @param int|float $value The value to format
+     * @param int       $type  Type of the formatting, one of the format type constants
+     *                         Only type NumberFormatter::TYPE_DEFAULT is currently supported.
      *
      * @return bool|string The formatted value or false on error
      *