Merge branch '3.4' into 4.4

* 3.4:
  [ExpressionLanguage] Fixed collisions of character operators with object properties
  [Validator] Remove specific check for Valid targets
  [PhpUnitBridge] Use trait instead of extending deprecated class
  fix remember me
  Use strict assertion in asset tests
  [DoctrineBridge][DoctrineExtractor] Fix indexBy with custom and some core types
  Do not rely on the current locale when dumping a Graphviz object
  fix typo
  [Ldap] force default network timeout
  [Config] don't throw on missing excluded paths
  Docs: Typo, grammar
  [Validator] Add the missing translations for the Polish ("pl") locale
  [Console] Inline exact-match handling with 4.4
  Set previous exception when rethrown from controller resolver
  [VarDumper] fixed DateCaster not displaying additional fields
  [HttpKernel] fix registering DebugHandlersListener regardless of the PHP_SAPI

Author: fabpot

Dumper/GraphvizDumper.php

@@ -26,10 +26,11 @@
  */
 class GraphvizDumper implements DumperInterface
 {
+    // All values should be strings
     protected static $defaultOptions = [
         'graph' => ['ratio' => 'compress', 'rankdir' => 'LR'],
-        'node' => ['fontsize' => 9, 'fontname' => 'Arial', 'color' => '#333333', 'fillcolor' => 'lightblue', 'fixedsize' => 'false', 'width' => 1],
-        'edge' => ['fontsize' => 9, 'fontname' => 'Arial', 'color' => '#333333', 'arrowhead' => 'normal', 'arrowsize' => 0.5],
+        'node' => ['fontsize' => '9', 'fontname' => 'Arial', 'color' => '#333333', 'fillcolor' => 'lightblue', 'fixedsize' => 'false', 'width' => '1'],
+        'edge' => ['fontsize' => '9', 'fontname' => 'Arial', 'color' => '#333333', 'arrowhead' => 'normal', 'arrowsize' => '0.5'],
     ];
 
     /**