Merge branch '3.4' into 4.2

* 3.4:
  Fix expired lock not cleaned
  [HttpFoundation] Fix SA/phpdoc JsonResponse
  SimpleCacheAdapter fails to cache any item if a namespace is used
  validate composite constraints in all groups
  [Serializer] Handle true and false appropriately in CSV encoder
  Fix binary operation `+`, `-` or `*` on string
  [VarDumper] fix dumping objects that implement __debugInfo()
  [Routing] fix absolute url generation when scheme is not known

Author: nicolas-grekas

Caster/Caster.php

@@ -48,13 +48,8 @@ class Caster
      */
     public static function castObject($obj, $class, $hasDebugInfo = false)
     {
-        if ($hasDebugInfo) {
-            $a = $obj->__debugInfo();
-        } elseif ($obj instanceof \Closure) {
-            $a = [];
-        } else {
-            $a = (array) $obj;
-        }
+        $a = $obj instanceof \Closure ? [] : (array) $obj;
+
         if ($obj instanceof \__PHP_Incomplete_Class) {
             return $a;
         }
@@ -88,6 +83,17 @@ public static function castObject($obj, $class, $hasDebugInfo = false)
             }
         }
 
+        if ($hasDebugInfo && \is_array($debugInfo = $obj->__debugInfo())) {
+            foreach ($debugInfo as $k => $v) {
+                if (!isset($k[0]) || "\0" !== $k[0]) {
+                    $k = self::PREFIX_VIRTUAL.$k;
+                }
+
+                unset($a[$k]);
+                $a[$k] = $v;
+            }
+        }
+
         return $a;
     }
 

Caster/DateCaster.php

@@ -88,7 +88,7 @@ public static function castPeriod(\DatePeriod $p, array $a, Stub $stub, $isNeste
                 if (self::PERIOD_LIMIT === $i) {
                     $now = new \DateTimeImmutable();
                     $dates[] = sprintf('%s more', ($end = $p->getEndDate())
-                        ? ceil(($end->format('U.u') - $d->format('U.u')) / ($now->add($p->getDateInterval())->format('U.u') - $now->format('U.u')))
+                        ? ceil(($end->format('U.u') - $d->format('U.u')) / ((int) $now->add($p->getDateInterval())->format('U.u') - (int) $now->format('U.u')))
                         : $p->recurrences - $i
                     );
                     break;