Explicitly mark nullable arguments (PHP8.4 compat)

Author: hfig

src/MAPI/MapiMessageFactory.php

@@ -9,7 +9,7 @@ class MapiMessageFactory
 {
     private $parent = null;
 
-    public function __construct(ConversionFactory $conversionFactory = null)
+    public function __construct(?ConversionFactory $conversionFactory = null)
     {
         $this->parent = $conversionFactory;
     }

src/MAPI/Message/Message.php

@@ -44,7 +44,7 @@ class Message extends MessageItem
 
 
 
-    public function __construct(Element $obj, Message $parent = null)
+    public function __construct(Element $obj, ?Message $parent = null)
     {
 
         $this->obj = $obj;

src/MAPI/Mime/Swiftmailer/Adapter/HeaderFactory.php

@@ -14,7 +14,7 @@ class HeaderFactory extends Swift_Mime_SimpleHeaderFactory
     protected $encoder;
     protected $charset;
 
-    public function __construct(Swift_Mime_HeaderEncoder $encoder, Swift_Encoder $paramEncoder, EmailValidator $emailValidator, $charset = null, Swift_AddressEncoder $addressEncoder = null)
+    public function __construct(Swift_Mime_HeaderEncoder $encoder, Swift_Encoder $paramEncoder, EmailValidator $emailValidator, $charset = null, ?Swift_AddressEncoder $addressEncoder = null)
     {
         parent::__construct($encoder, $paramEncoder, $emailValidator, $charset, $addressEncoder);
 

src/MAPI/OLE/Pear/DocumentElementCollection.php

@@ -11,7 +11,7 @@ class DocumentElementCollection implements \ArrayAccess, \IteratorAggregate
     private $col = [];
     private $proxy_col = [];
 
-    public function __construct(OLE $ole, array &$collection = null)
+    public function __construct(OLE $ole, ?array &$collection = null)
     {
         if (is_null($collection)) {
             $tmpcol = [];

src/MAPI/Property/PropertyStore.php

@@ -30,7 +30,7 @@ class PropertyStore
     protected $logger;
 
 
-    public function __construct(Element $obj = null, $nameId = null, LoggerInterface $logger = null)
+    public function __construct(?Element $obj = null, $nameId = null, ?LoggerInterface $logger = null)
     {
         $this->cache = new PropertyCollection();
         $this->nameId = null;