Merge branch '5.3' into 5.4

* 5.3:
  [Process] intersect with getenv() in case-insensitive manner to get default envs
  [Serializer] fix support for lazy/unset properties
  Fix redundant type casts
  [Notifier] Fix AllMySms bridge body content
  Revert "[DoctrineBridge] add support for the JSON type"

Author: nicolas-grekas

Request.php

@@ -1969,7 +1969,7 @@ protected function preparePathInfo()
             return '/';
         }
 
-        return (string) $pathInfo;
+        return $pathInfo;
     }
 
     /**

Session/Flash/AutoExpireFlashBag.php

@@ -78,7 +78,7 @@ public function peek(string $type, array $default = [])
      */
     public function peekAll()
     {
-        return \array_key_exists('display', $this->flashes) ? (array) $this->flashes['display'] : [];
+        return \array_key_exists('display', $this->flashes) ? $this->flashes['display'] : [];
     }
 
     /**

Session/Storage/Proxy/SessionHandlerProxy.php

@@ -21,7 +21,7 @@ class SessionHandlerProxy extends AbstractProxy implements \SessionHandlerInterf
     public function __construct(\SessionHandlerInterface $handler)
     {
         $this->handler = $handler;
-        $this->wrapper = ($handler instanceof \SessionHandler);
+        $this->wrapper = $handler instanceof \SessionHandler;
         $this->saveHandlerName = $this->wrapper ? ini_get('session.save_handler') : 'user';
     }
 
@@ -41,7 +41,7 @@ public function getHandler()
     #[\ReturnTypeWillChange]
     public function open($savePath, $sessionName)
     {
-        return (bool) $this->handler->open($savePath, $sessionName);
+        return $this->handler->open($savePath, $sessionName);
     }
 
     /**
@@ -50,16 +50,16 @@ public function open($savePath, $sessionName)
     #[\ReturnTypeWillChange]
     public function close()
     {
-        return (bool) $this->handler->close();
+        return $this->handler->close();
     }
 
     /**
-     * @return string
+     * @return string|false
      */
     #[\ReturnTypeWillChange]
     public function read($sessionId)
     {
-        return (string) $this->handler->read($sessionId);
+        return $this->handler->read($sessionId);
     }
 
     /**
@@ -68,7 +68,7 @@ public function read($sessionId)
     #[\ReturnTypeWillChange]
     public function write($sessionId, $data)
     {
-        return (bool) $this->handler->write($sessionId, $data);
+        return $this->handler->write($sessionId, $data);
     }
 
     /**
@@ -77,7 +77,7 @@ public function write($sessionId, $data)
     #[\ReturnTypeWillChange]
     public function destroy($sessionId)
     {
-        return (bool) $this->handler->destroy($sessionId);
+        return $this->handler->destroy($sessionId);
     }
 
     /**