diff --git a/core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php b/core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php
index 9ea14f8..ba55764 100644
--- a/core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php
+++ b/core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php
@@ -239,11 +239,9 @@ public function buildForm(array $form, FormStateInterface $form_state) {
    * {@inheritdoc}
    */
   public function validateForm(array &$form, FormStateInterface $form_state) {
-    // HELP NEEDED: user_validate_name is broken with the new API, skip it until
-    // we can work out what is going on.
-//    if ($error = user_validate_name($form_state->getValue(array('account', 'name')))) {
-//      $form_state->setErrorByName('account][name', $error);
-//    }
+    if ($error = user_validate_name($form_state->getValue(array('account', 'name')))) {
+      $form_state->setErrorByName('account][name', $error);
+    }
   }
 
   /**
diff --git a/core/lib/Drupal/Core/TypedData/Validation/Metadata.php b/core/lib/Drupal/Core/TypedData/Validation/Metadata.php
index acb0724..59bda1d 100755
--- a/core/lib/Drupal/Core/TypedData/Validation/Metadata.php
+++ b/core/lib/Drupal/Core/TypedData/Validation/Metadata.php
@@ -129,6 +129,6 @@ public function getCascadingStrategy() {
    * {@inheritdoc}
    */
   public function getTraversalStrategy() {
-    return TraversalStrategy::IMPLICIT;
+    return TraversalStrategy::NONE;
   }
 }
diff --git a/core/vendor/symfony/validator/Symfony/Component/Validator/Validator/RecursiveContextualValidator.php b/core/vendor/symfony/validator/Symfony/Component/Validator/Validator/RecursiveContextualValidator.php
index c1cfbb5..2da1887 100644
--- a/core/vendor/symfony/validator/Symfony/Component/Validator/Validator/RecursiveContextualValidator.php
+++ b/core/vendor/symfony/validator/Symfony/Component/Validator/Validator/RecursiveContextualValidator.php
@@ -419,8 +419,7 @@ private function validateEachObjectIn($collection, $propertyPath, array $groups,
 
             // Scalar and null values in the collection are ignored
             // (BC with Symfony < 2.5)
-            // HELP NEEDED: String can't be validated, I think we're recursing one level too far
-            if (is_object($value) && ($value instanceof \Drupal\Core\TypedData\ComplexDataInterface || $value instanceof \Drupal\Core\TypedData\ListInterface)) {
+            if (is_object($value)) {
                 $this->validateObject(
                     $value,
                     $propertyPath.'['.$key.']',