Merge branch '2.8' into 3.2

* 2.8:
  [Serializer] Removed duplicate operation in camelcase denormalization
  [Validator] do not guess getter method names

Author: fabpot

NameConverter/CamelCaseToSnakeCaseNameConverter.php

@@ -76,7 +76,7 @@ public function denormalize($propertyName)
         }
 
         if (null === $this->attributes || in_array($camelCasedName, $this->attributes)) {
-            return $this->lowerCamelCase ? lcfirst($camelCasedName) : $camelCasedName;
+            return $camelCasedName;
         }
 
         return $propertyName;