[Validator] phpize default option values

This makes the behavior for default constraints inline with the behavior
when the option is given explicitly.

src/Symfony/Component/Validator/Mapping/Loader/XmlFileLoader.php

@@ -84,7 +84,7 @@ class XmlFileLoader extends FileLoader
                     $options = array();
                 }
             } elseif (strlen((string) $node) > 0) {
-                $options = trim($node);
+                $options = XmlUtils::phpize(trim($node));
             } else {
                 $options = null;
             }

src/Symfony/Component/Validator/Tests/Mapping/Loader/XmlFileLoaderTest.php

@@ -19,6 +19,7 @@ use Symfony\Component\Validator\Constraints\NotNull;
 use Symfony\Component\Validator\Constraints\Range;
 use Symfony\Component\Validator\Constraints\Regex;
 use Symfony\Component\Validator\Constraints\IsTrue;
+use Symfony\Component\Validator\Constraints\Traverse;
 use Symfony\Component\Validator\Exception\MappingException;
 use Symfony\Component\Validator\Mapping\ClassMetadata;
 use Symfony\Component\Validator\Mapping\Loader\XmlFileLoader;
@@ -57,6 +58,7 @@ class XmlFileLoaderTest extends \PHPUnit_Framework_TestCase
         $expected->addConstraint(new Callback('validateMe'));
         $expected->addConstraint(new Callback('validateMeStatic'));
         $expected->addConstraint(new Callback(array('Symfony\Component\Validator\Tests\Fixtures\CallbackClass', 'callback')));
+        $expected->addConstraint(new Traverse(false));
         $expected->addPropertyConstraint('firstName', new NotNull());
         $expected->addPropertyConstraint('firstName', new Range(array('min' => 3)));
         $expected->addPropertyConstraint('firstName', new Choice(array('A', 'B')));

src/Symfony/Component/Validator/Tests/Mapping/Loader/constraint-mapping.xml

@@ -31,6 +31,11 @@
         <value>callback</value>
     </constraint>
 
+    <!-- Traverse with boolean default option -->
+    <constraint name="Traverse">
+        false
+    </constraint>
+
     <!-- PROPERTY CONSTRAINTS -->
 
     <property name="firstName">