Merge branch '4.4' into 5.1

* 4.4:
  Dont allow unserializing classes with a destructor
  Dont allow unserializing classes with a destructor - 4.4
  [Cache] fix possible collision when writing tmp file in filesystem adapter
  a colon followed by spaces exclusively separates mapping keys and values
  Contracts: Remove ellipsis
  fix handling float-like key attribute values
  Fix missing BCC recipients in SES bridge

Author: nicolas-grekas

Loader/Configurator/CollectionConfigurator.php

@@ -38,6 +38,16 @@ public function __construct(RouteCollection $parent, string $name, self $parentC
         $this->parentPrefixes = $parentPrefixes;
     }
 
+    public function __sleep()
+    {
+        throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
+    }
+
+    public function __wakeup()
+    {
+        throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
+    }
+
     public function __destruct()
     {
         if (null === $this->prefixes) {

Loader/Configurator/ImportConfigurator.php

@@ -30,6 +30,16 @@ public function __construct(RouteCollection $parent, RouteCollection $route)
         $this->route = $route;
     }
 
+    public function __sleep()
+    {
+        throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
+    }
+
+    public function __wakeup()
+    {
+        throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
+    }
+
     public function __destruct()
     {
         $this->parent->addCollection($this->route);