Merge branch '3.3' into 3.4

* 3.3:
  Random fixes
  Docblock fixes
  [HttpKernel] Enhance deprecation message
  [SecurityBundle] Fix the datacollector to properly support decision.object being null

Author: nicolas-grekas

Constraints/AbstractComparisonValidator.php

@@ -69,7 +69,7 @@ public function validate($value, Constraint $constraint)
             if ($value instanceof \DateTimeImmutable) {
                 // If $value is immutable, convert the compared value to a
                 // DateTimeImmutable too
-                $comparedValue = new \DatetimeImmutable($comparedValue);
+                $comparedValue = new \DateTimeImmutable($comparedValue);
             } elseif ($value instanceof \DateTimeInterface) {
                 // Otherwise use DateTime
                 $comparedValue = new \DateTime($comparedValue);

Mapping/Loader/LoaderChain.php

@@ -56,4 +56,12 @@ public function loadClassMetadata(ClassMetadata $metadata)
 
         return $success;
     }
+
+    /**
+     * @return LoaderInterface[]
+     */
+    public function getLoaders()
+    {
+        return $this->loaders;
+    }
 }