Merge branch '6.4' into 7.2

* 6.4:
  [Validator] add pl translation for the Twig constraint
  dump default value for property hooks if present

Author: fabpot

ProxyHelper.php

@@ -79,7 +79,9 @@ public static function generateLazyGhost(\ReflectionClass $class): string
             $hooks .= "\n    "
                 .($p->isProtected() ? 'protected' : 'public')
                 .($p->isProtectedSet() ? ' protected(set)' : '')
-                ." {$type} \${$name} {\n";
+                ." {$type} \${$name}"
+                .($p->hasDefaultValue() ? ' = '.$p->getDefaultValue() : '')
+                ." {\n";
 
             foreach ($p->getHooks() as $hook => $method) {
                 if ('get' === $hook) {