rector: add ReadOnlyPropertyRector

If class properties are never set outside the ctor, they can be marked
as readonly.

rector.php

@@ -8,6 +8,7 @@
 use Rector\Php80\Rector\Class_\ClassPropertyAssignToConstructorPromotionRector;
 use Rector\Php80\Rector\FuncCall\ClassOnObjectRector;
 use Rector\Php81\Rector\Array_\FirstClassCallableRector;
+use Rector\Php81\Rector\Property\ReadOnlyPropertyRector;
 use Rector\PHPUnit\Set\PHPUnitSetList;
 
 return RectorConfig::configure()
@@ -24,6 +25,7 @@
 		IfIssetToCoalescingRector::class,
 		JsonThrowOnErrorRector::class,
 		NullCoalescingOperatorRector::class,
+		ReadOnlyPropertyRector::class,
 	])
 	->withSets([
 		PHPUnitSetList::PHPUNIT_100,

src/lib/Smr/Blackjack/Table.php

@@ -7,7 +7,7 @@
  */
 class Table {
 
-	private Deck $deck;
+	private readonly Deck $deck;
 	public Hand $playerHand;
 	public Hand $dealerHand;
 

src/lib/Smr/Routes/RouteIterator.php

@@ -12,12 +12,12 @@
 class RouteIterator {
 
 	/** @var InfiniteIterator<int, OneWayRoute, ArrayIterator<int, OneWayRoute>> */
-	private InfiniteIterator $routeIterator;
+	private readonly InfiniteIterator $routeIterator;
 
 	private TransactionType $transaction = TransactionType::Buy;
 
 	public function __construct(
-		private MultiplePortRoute $route,
+		private readonly MultiplePortRoute $route,
 	) {
 		$oneWayRoutes = $route->getOneWayRoutes();
 		$this->routeIterator = new InfiniteIterator(new ArrayIterator($oneWayRoutes));

src/lib/Smr/Session.php

@@ -42,7 +42,7 @@ class Session {
 	private array $requestData = [];
 	private bool $generate;
 	public readonly bool $ajax;
-	private string $SN;
+	private readonly string $SN;
 	private string $lastSN;
 	private int $accountID;
 	private float $lastAccessed;