commit 886fc5ef113d7936637475ecde97d1da4bcc2d69
Author: Lee Rowlands <lee.rowlands@previousnext.com.au>
Date:   Tue Nov 17 09:49:53 2015 +1000

    p20

diff --git a/core/modules/comment/src/CommentStorage.php b/core/modules/comment/src/CommentStorage.php
index 099e5f4..4f4efb0 100644
--- a/core/modules/comment/src/CommentStorage.php
+++ b/core/modules/comment/src/CommentStorage.php
@@ -337,4 +337,16 @@ public function getUnapprovedCount() {
       ->fetchField();
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  protected function doPreSave(EntityInterface $entity) {
+    /* @var \Drupal\comment\CommentInterface $entity */
+    if (!$entity->getOwner()->isAnonymous()) {
+      $entity->set('name', NULL);
+      $entity->set('mail', NULL);
+    }
+    return parent::doPreSave($entity);
+  }
+
 }
diff --git a/core/modules/comment/src/Tests/CommentInterfaceTest.php b/core/modules/comment/src/Tests/CommentInterfaceTest.php
index b81494e..9893e85 100644
--- a/core/modules/comment/src/Tests/CommentInterfaceTest.php
+++ b/core/modules/comment/src/Tests/CommentInterfaceTest.php
@@ -230,7 +230,7 @@ public function testCommentEdit() {
     // Create a comment and make sure it is stored correctly.
     $comment = $this->postComment($this->node, $comment_text, $subject_text, TRUE);
     $this->assertTrue($this->commentExists($comment), 'Comment found.');
-    $this->assertNull($comment->get('name'), 'Comment author name stored in database is NULL for registered user.');
+    $this->assertNull($comment->get('name')->value, 'Comment author name stored in database is NULL for registered user.');
     $this->assertEqual($comment->getAuthorName(), $this->adminUser->getAccountName(), 'Comment author name returned by API is current user.');
     $this->assertEqual($comment->getOwnerId(), $this->adminUser->id(), 'Comment owner is current user.');