Merge branch '6.3' into 6.4

* 6.3:
  [DependencyInjection] Fix dumping containers with null-referenced services
  [Routing] Fix removing aliases pointing to removed route in RouteCollection::remove()
  [VarExporter] Fix lazy ghost trait when using nullsafe operator

Author: derrabus

RouteCollection.php

@@ -147,8 +147,15 @@ public function get(string $name): ?Route
      */
     public function remove(string|array $name)
     {
-        foreach ((array) $name as $n) {
-            unset($this->routes[$n], $this->priorities[$n], $this->aliases[$n]);
+        $names = (array) $name;
+        foreach ($names as $n) {
+            unset($this->routes[$n], $this->priorities[$n]);
+        }
+
+        foreach ($this->aliases as $k => $alias) {
+            if (\in_array($alias->getId(), $names, true)) {
+                unset($this->aliases[$k]);
+            }
         }
     }
 

Tests/RouteCollectionTest.php

@@ -225,11 +225,13 @@ public function testRemove()
         $collection1->add('bar', $bar = new Route('/bar'));
         $collection->addCollection($collection1);
         $collection->add('last', $last = new Route('/last'));
+        $collection->addAlias('ccc_my_custom_alias', 'foo');
 
         $collection->remove('foo');
         $this->assertSame(['bar' => $bar, 'last' => $last], $collection->all(), '->remove() can remove a single route');
         $collection->remove(['bar', 'last']);
         $this->assertSame([], $collection->all(), '->remove() accepts an array and can remove multiple routes at once');
+        $this->assertNull($collection->getAlias('ccc_my_custom_alias'));
     }
 
     public function testSetHost()