diff --git a/extensions/akismet/src/Akismet.php b/extensions/akismet/src/Akismet.php
index a4edef634..0182144ec 100644
--- a/extensions/akismet/src/Akismet.php
+++ b/extensions/akismet/src/Akismet.php
@@ -15,22 +15,19 @@ use Psr\Http\Message\ResponseInterface;
 
 class Akismet
 {
-    private $apiKey;
-    private $apiUrl;
-    private $flarumVersion;
-    private $extensionVersion;
+    private string $apiUrl;
+    private array $params = [];
 
-    private $params = [];
-
-    public function __construct(string $apiKey, string $homeUrl, string $flarumVersion, string $extensionVersion, bool $inDebugMode = false)
-    {
-        $this->apiKey = $apiKey;
+    public function __construct(
+        private readonly string $apiKey,
+        string $homeUrl,
+        private readonly string $flarumVersion,
+        private readonly string $extensionVersion,
+        bool $inDebugMode = false
+    ) {
         $this->apiUrl = "https://$apiKey.rest.akismet.com/1.1";
         $this->params['blog'] = $homeUrl;
 
-        $this->flarumVersion = $flarumVersion;
-        $this->extensionVersion = $extensionVersion;
-
         if ($inDebugMode) {
             $this->params['is_test'] = true;
         }
@@ -73,7 +70,7 @@ class Akismet
     /**
      * @throws GuzzleException
      */
-    public function submitSpam()
+    public function submitSpam(): void
     {
         $this->sendRequest('submit-spam');
     }
@@ -81,7 +78,7 @@ class Akismet
     /**
      * @throws GuzzleException
      */
-    public function submitHam()
+    public function submitHam(): void
     {
         $this->sendRequest('submit-ham');
     }
@@ -90,7 +87,7 @@ class Akismet
      * Allows you to set additional parameter
      * This lets you use Akismet features not supported directly in this util.
      */
-    public function withParam(string $key, $value): Akismet
+    public function withParam(string $key, mixed $value): Akismet
     {
         $new = clone $this;
         $new->params[$key] = $value;
diff --git a/extensions/likes/src/Access/LikePostPolicy.php b/extensions/likes/src/Access/LikePostPolicy.php
index e83e686eb..86e4b6e63 100644
--- a/extensions/likes/src/Access/LikePostPolicy.php
+++ b/extensions/likes/src/Access/LikePostPolicy.php
@@ -21,10 +21,12 @@ class LikePostPolicy extends AbstractPolicy
     ) {
     }
 
-    public function like(User $actor, Post $post)
+    public function like(User $actor, Post $post): ?string
     {
         if ($actor->id === $post->user_id && ! (bool) $this->settings->get('flarum-likes.like_own_post')) {
             return $this->deny();
         }
+
+        return null;
     }
 }
diff --git a/extensions/lock/src/Access/DiscussionPolicy.php b/extensions/lock/src/Access/DiscussionPolicy.php
index c11acff8d..6b98c2a95 100755
--- a/extensions/lock/src/Access/DiscussionPolicy.php
+++ b/extensions/lock/src/Access/DiscussionPolicy.php
@@ -15,10 +15,12 @@ use Flarum\User\User;
 
 class DiscussionPolicy extends AbstractPolicy
 {
-    public function reply(User $actor, Discussion $discussion)
+    public function reply(User $actor, Discussion $discussion): ?string
     {
         if ($discussion->is_locked && $actor->cannot('lock', $discussion)) {
             return $this->deny();
         }
+
+        return null;
     }
 }
diff --git a/extensions/mentions/src/ConfigureMentions.php b/extensions/mentions/src/ConfigureMentions.php
index de8ba797d..2670dbb2e 100644
--- a/extensions/mentions/src/ConfigureMentions.php
+++ b/extensions/mentions/src/ConfigureMentions.php
@@ -82,9 +82,9 @@ class ConfigureMentions
     /**
      * @param FormatterTag $tag
      * @param array{users: Collection<int, User>} $mentions
-     * @return bool|void
+     * @return bool|null
      */
-    public static function addUserId(FormatterTag $tag, array $mentions)
+    public static function addUserId(FormatterTag $tag, array $mentions): ?bool
     {
         $allow_username_format = (bool) resolve(SettingsRepositoryInterface::class)->get('flarum-mentions.allow_username_format');
 
@@ -102,6 +102,8 @@ class ConfigureMentions
         }
 
         $tag->invalidate();
+
+        return null;
     }
 
     private function configurePostMentions(Configurator $config): void
@@ -141,9 +143,9 @@ class ConfigureMentions
     /**
      * @param FormatterTag $tag
      * @param array{posts: Collection<int, Post>} $mentions
-     * @return bool|void
+     * @return bool|null
      */
-    public static function addPostId(FormatterTag $tag, array $mentions)
+    public static function addPostId(FormatterTag $tag, array $mentions): ?bool
     {
         $post = $mentions['posts']->where('id', $tag->getAttribute('id'))->first();
 
@@ -157,9 +159,11 @@ class ConfigureMentions
 
             return true;
         }
+
+        return null;
     }
 
-    private function configureGroupMentions(Configurator $config)
+    private function configureGroupMentions(Configurator $config): void
     {
         $tagName = 'GROUPMENTION';
 
@@ -214,9 +218,9 @@ class ConfigureMentions
      * @param FormatterTag $tag
      * @param User $actor
      * @param array{groups: Collection<int, Group>} $mentions
-     * @return bool|void
+     * @return bool|null
      */
-    public static function addGroupId(FormatterTag $tag, User $actor, array $mentions)
+    public static function addGroupId(FormatterTag $tag, User $actor, array $mentions): ?bool
     {
         $id = $tag->getAttribute('id');
 
@@ -236,9 +240,11 @@ class ConfigureMentions
         }
 
         $tag->invalidate();
+
+        return null;
     }
 
-    private function configureTagMentions(Configurator $config)
+    private function configureTagMentions(Configurator $config): void
     {
         $config->rendering->parameters['TAG_URL'] = $this->url->to('forum')->route('tag', ['slug' => '']);
 
@@ -303,9 +309,9 @@ class ConfigureMentions
     /**
      * @param FormatterTag $tag
      * @param array{tags: Collection<int, Tag>} $mentions
-     * @return true|void
+     * @return bool|null
      */
-    public static function addTagId(FormatterTag $tag, array $mentions)
+    public static function addTagId(FormatterTag $tag, array $mentions): ?bool
     {
         /** @var Tag|null $model */
         $model = $mentions['tags']->where('slug', $tag->getAttribute('slug'))->first();
@@ -316,6 +322,8 @@ class ConfigureMentions
 
             return true;
         }
+
+        return null;
     }
 
     /**
diff --git a/extensions/mentions/src/Formatter/UnparsePostMentions.php b/extensions/mentions/src/Formatter/UnparsePostMentions.php
index 3c32dee0b..519c3f4a1 100644
--- a/extensions/mentions/src/Formatter/UnparsePostMentions.php
+++ b/extensions/mentions/src/Formatter/UnparsePostMentions.php
@@ -29,7 +29,7 @@ class UnparsePostMentions
     /**
      * Updates XML post mention tags before unparsing so that unparsing uses new display names.
      */
-    protected function updatePostMentionTags($context, string $xml): string
+    protected function updatePostMentionTags(mixed $context, string $xml): string
     {
         $post = $context;
 
diff --git a/extensions/nicknames/src/Access/UserPolicy.php b/extensions/nicknames/src/Access/UserPolicy.php
index c7791beb2..1d827961f 100644
--- a/extensions/nicknames/src/Access/UserPolicy.php
+++ b/extensions/nicknames/src/Access/UserPolicy.php
@@ -20,7 +20,7 @@ class UserPolicy extends AbstractPolicy
     ) {
     }
 
-    public function editNickname(User $actor, User $user)
+    public function editNickname(User $actor, User $user): ?string
     {
         if ($actor->isGuest() && ! $user->exists && $this->settings->get('flarum-nicknames.set_on_registration')) {
             return $this->allow();
@@ -29,5 +29,7 @@ class UserPolicy extends AbstractPolicy
         } elseif ($actor->can('edit', $user)) {
             return $this->allow();
         }
+
+        return null;
     }
 }
diff --git a/extensions/suspend/src/Access/UserPolicy.php b/extensions/suspend/src/Access/UserPolicy.php
index 5b6299d97..25fd0ca6d 100644
--- a/extensions/suspend/src/Access/UserPolicy.php
+++ b/extensions/suspend/src/Access/UserPolicy.php
@@ -14,10 +14,12 @@ use Flarum\User\User;
 
 class UserPolicy extends AbstractPolicy
 {
-    public function suspend(User $actor, User $user)
+    public function suspend(User $actor, User $user): ?string
     {
         if ($user->isAdmin() || $user->id === $actor->id) {
             return $this->deny();
         }
+
+        return null;
     }
 }
diff --git a/extensions/tags/src/Access/DiscussionPolicy.php b/extensions/tags/src/Access/DiscussionPolicy.php
index a84897b77..3790782e9 100755
--- a/extensions/tags/src/Access/DiscussionPolicy.php
+++ b/extensions/tags/src/Access/DiscussionPolicy.php
@@ -22,7 +22,7 @@ class DiscussionPolicy extends AbstractPolicy
     ) {
     }
 
-    public function can(User $actor, string $ability, Discussion $discussion)
+    public function can(User $actor, string $ability, Discussion $discussion): ?string
     {
         // Wrap all discussion permission checks with some logic pertaining to
         // the discussion's tags. If the discussion has a tag that has been
@@ -46,13 +46,15 @@ class DiscussionPolicy extends AbstractPolicy
                 return $this->allow();
             }
         }
+
+        return null;
     }
 
     /**
      * This method checks, if the user is still allowed to edit the tags
      * based on the configuration item.
      */
-    public function tag(User $actor, Discussion $discussion)
+    public function tag(User $actor, Discussion $discussion): ?string
     {
         if ($discussion->user_id == $actor->id && $actor->can('reply', $discussion)) {
             $allowEditTags = $this->settings->get('allow_tag_change');
@@ -65,5 +67,7 @@ class DiscussionPolicy extends AbstractPolicy
                 return $this->allow();
             }
         }
+
+        return null;
     }
 }
diff --git a/extensions/tags/src/Access/GlobalPolicy.php b/extensions/tags/src/Access/GlobalPolicy.php
index 7218d1778..b3abfc01e 100644
--- a/extensions/tags/src/Access/GlobalPolicy.php
+++ b/extensions/tags/src/Access/GlobalPolicy.php
@@ -21,7 +21,7 @@ class GlobalPolicy extends AbstractPolicy
     ) {
     }
 
-    public function can(User $actor, string $ability)
+    public function can(User $actor, string $ability): ?string
     {
         static $enoughPrimary;
         static $enoughSecondary;
@@ -67,5 +67,7 @@ class GlobalPolicy extends AbstractPolicy
                 return $this->deny();
             }
         }
+
+        return null;
     }
 }
diff --git a/extensions/tags/src/Access/TagPolicy.php b/extensions/tags/src/Access/TagPolicy.php
index b8977b16b..2a9f89d74 100755
--- a/extensions/tags/src/Access/TagPolicy.php
+++ b/extensions/tags/src/Access/TagPolicy.php
@@ -15,7 +15,7 @@ use Flarum\User\User;
 
 class TagPolicy extends AbstractPolicy
 {
-    public function can(User $actor, string $ability, Tag $tag)
+    public function can(User $actor, string $ability, Tag $tag): string|bool|null
     {
         if ($tag->parent_id !== null && ! $actor->can($ability, $tag->parent)) {
             return $this->deny();
@@ -26,6 +26,8 @@ class TagPolicy extends AbstractPolicy
 
             return $actor->hasPermission("tag$id.$ability");
         }
+
+        return null;
     }
 
     public function addToDiscussion(User $actor, Tag $tag): bool
diff --git a/extensions/tags/src/Content/Tag.php b/extensions/tags/src/Content/Tag.php
index 33b1855a6..01804fc90 100644
--- a/extensions/tags/src/Content/Tag.php
+++ b/extensions/tags/src/Content/Tag.php
@@ -89,12 +89,12 @@ class Tag
     /**
      * Get the result of an API request to list discussions.
      */
-    protected function getApiDocument(Request $request, array $params)
+    protected function getApiDocument(Request $request, array $params): object
     {
         return json_decode($this->api->withParentRequest($request)->withQueryParams($params)->get('/discussions')->getBody());
     }
 
-    protected function getTagsDocument(Request $request, string $slug)
+    protected function getTagsDocument(Request $request, string $slug): object
     {
         return json_decode($this->api->withParentRequest($request)->withQueryParams([
             'include' => 'children,children.parent,parent,parent.children.parent,state'
diff --git a/extensions/tags/src/Content/Tags.php b/extensions/tags/src/Content/Tags.php
index 993f21b7b..b17c5da0b 100644
--- a/extensions/tags/src/Content/Tags.php
+++ b/extensions/tags/src/Content/Tags.php
@@ -34,14 +34,14 @@ class Tags
     public function __invoke(Document $document, Request $request): Document
     {
         $apiDocument = $this->getTagsDocument($request);
-        $tags = collect(Arr::get($apiDocument, 'data', []));
+        $tags = collect((array) Arr::get($apiDocument, 'data', []));
 
         $childTags = $tags->where('attributes.isChild', true);
         $primaryTags = $tags->where('attributes.isChild', false)->where('attributes.position', '!==', null)->sortBy('attributes.position');
         $secondaryTags = $tags->where('attributes.isChild', false)->where('attributes.position', '===', null)->sortBy('attributes.name');
 
         $children = $primaryTags->mapWithKeys(function ($tag) use ($childTags) {
-            $childIds = collect(Arr::get($tag, 'relationships.children.data'))->pluck('id');
+            $childIds = collect((array) Arr::get($tag, 'relationships.children.data'))->pluck('id');
 
             return [$tag['id'] => $childTags->whereIn('id', $childIds)->sortBy('position')];
         });
@@ -56,7 +56,7 @@ class Tags
         return $document;
     }
 
-    protected function getTagsDocument(Request $request)
+    protected function getTagsDocument(Request $request): array
     {
         return json_decode($this->api->withParentRequest($request)->withQueryParams([
             'include' => 'children,lastPostedDiscussion,parent'
diff --git a/extensions/tags/src/Query/TagFilterGambit.php b/extensions/tags/src/Query/TagFilterGambit.php
index afa7a46a4..23d2218fb 100644
--- a/extensions/tags/src/Query/TagFilterGambit.php
+++ b/extensions/tags/src/Query/TagFilterGambit.php
@@ -49,7 +49,7 @@ class TagFilterGambit extends AbstractRegexGambit implements FilterInterface
         $this->constrain($filterState->getQuery(), $filterValue, $negate, $filterState->getActor());
     }
 
-    protected function constrain(Builder $query, string|array $rawSlugs, $negate, User $actor): void
+    protected function constrain(Builder $query, string|array $rawSlugs, bool $negate, User $actor): void
     {
         $slugs = $this->asStringArray($rawSlugs);
 
diff --git a/framework/core/src/Api/Controller/CreatePostController.php b/framework/core/src/Api/Controller/CreatePostController.php
index 93e3e8e79..717b5ab4d 100644
--- a/framework/core/src/Api/Controller/CreatePostController.php
+++ b/framework/core/src/Api/Controller/CreatePostController.php
@@ -39,9 +39,10 @@ class CreatePostController extends AbstractCreateController
     {
         $actor = RequestUtil::getActor($request);
         $data = Arr::get($request->getParsedBody(), 'data', []);
-        $discussionId = Arr::get($data, 'relationships.discussion.data.id');
+        $discussionId = (int) Arr::get($data, 'relationships.discussion.data.id');
         $ipAddress = $request->getAttribute('ipAddress');
 
+        /** @var CommentPost $post */
         $post = $this->bus->dispatch(
             new PostReply($discussionId, $actor, $data, $ipAddress)
         );
@@ -56,7 +57,7 @@ class CreatePostController extends AbstractCreateController
         }
 
         $discussion = $post->discussion;
-        $discussion->posts = $discussion->posts()->whereVisibleTo($actor)->orderBy('created_at')->pluck('id');
+        $discussion->setRelation('posts', $discussion->posts()->whereVisibleTo($actor)->orderBy('created_at')->pluck('id'));
 
         $this->loadRelations($post->newCollection([$post]), $this->extractInclude($request), $request);
 
diff --git a/framework/core/src/Api/Controller/UpdateDiscussionController.php b/framework/core/src/Api/Controller/UpdateDiscussionController.php
index 7e6380217..24516159c 100644
--- a/framework/core/src/Api/Controller/UpdateDiscussionController.php
+++ b/framework/core/src/Api/Controller/UpdateDiscussionController.php
@@ -33,7 +33,7 @@ class UpdateDiscussionController extends AbstractShowController
     protected function data(ServerRequestInterface $request, Document $document): Discussion
     {
         $actor = RequestUtil::getActor($request);
-        $discussionId = Arr::get($request->getQueryParams(), 'id');
+        $discussionId = (int) Arr::get($request->getQueryParams(), 'id');
         $data = Arr::get($request->getParsedBody(), 'data', []);
 
         /** @var Discussion $discussion */
diff --git a/framework/core/src/Api/Middleware/ThrottleApi.php b/framework/core/src/Api/Middleware/ThrottleApi.php
index f85b345ab..317695678 100644
--- a/framework/core/src/Api/Middleware/ThrottleApi.php
+++ b/framework/core/src/Api/Middleware/ThrottleApi.php
@@ -17,11 +17,9 @@ use Psr\Http\Server\RequestHandlerInterface as Handler;
 
 class ThrottleApi implements Middleware
 {
-    protected $throttlers;
-
-    public function __construct(array $throttlers)
-    {
-        $this->throttlers = $throttlers;
+    public function __construct(
+        protected array $throttlers
+    ) {
     }
 
     public function process(Request $request, Handler $handler): Response
@@ -33,9 +31,6 @@ class ThrottleApi implements Middleware
         return $handler->handle($request);
     }
 
-    /**
-     * @return bool
-     */
     public function throttle(Request $request): bool
     {
         $throttle = false;
diff --git a/framework/core/src/Api/Serializer/BasicDiscussionSerializer.php b/framework/core/src/Api/Serializer/BasicDiscussionSerializer.php
index c155e448b..5f18cbb73 100644
--- a/framework/core/src/Api/Serializer/BasicDiscussionSerializer.php
+++ b/framework/core/src/Api/Serializer/BasicDiscussionSerializer.php
@@ -40,37 +40,37 @@ class BasicDiscussionSerializer extends AbstractSerializer
         ];
     }
 
-    protected function user($discussion): ?Relationship
+    protected function user(Discussion $discussion): ?Relationship
     {
         return $this->hasOne($discussion, BasicUserSerializer::class);
     }
 
-    protected function firstPost($discussion): ?Relationship
+    protected function firstPost(Discussion $discussion): ?Relationship
     {
         return $this->hasOne($discussion, BasicPostSerializer::class);
     }
 
-    protected function lastPostedUser($discussion): ?Relationship
+    protected function lastPostedUser(Discussion $discussion): ?Relationship
     {
         return $this->hasOne($discussion, BasicUserSerializer::class);
     }
 
-    protected function lastPost($discussion): ?Relationship
+    protected function lastPost(Discussion $discussion): ?Relationship
     {
         return $this->hasOne($discussion, BasicPostSerializer::class);
     }
 
-    protected function posts($discussion): ?Relationship
+    protected function posts(Discussion $discussion): ?Relationship
     {
         return $this->hasMany($discussion, PostSerializer::class);
     }
 
-    protected function mostRelevantPost($discussion): ?Relationship
+    protected function mostRelevantPost(Discussion $discussion): ?Relationship
     {
         return $this->hasOne($discussion, PostSerializer::class);
     }
 
-    protected function hiddenUser($discussion): ?Relationship
+    protected function hiddenUser(Discussion $discussion): ?Relationship
     {
         return $this->hasOne($discussion, BasicUserSerializer::class);
     }
diff --git a/framework/core/src/Api/Serializer/BasicUserSerializer.php b/framework/core/src/Api/Serializer/BasicUserSerializer.php
index 3f14efa13..4f2f55384 100644
--- a/framework/core/src/Api/Serializer/BasicUserSerializer.php
+++ b/framework/core/src/Api/Serializer/BasicUserSerializer.php
@@ -42,7 +42,7 @@ class BasicUserSerializer extends AbstractSerializer
         ];
     }
 
-    protected function groups($user): Relationship
+    protected function groups(User $user): Relationship
     {
         if ($this->getActor()->can('viewHiddenGroups')) {
             return $this->hasMany($user, GroupSerializer::class);
diff --git a/framework/core/src/Api/Serializer/ForumSerializer.php b/framework/core/src/Api/Serializer/ForumSerializer.php
index afe0a744c..f5a9bfdb7 100644
--- a/framework/core/src/Api/Serializer/ForumSerializer.php
+++ b/framework/core/src/Api/Serializer/ForumSerializer.php
@@ -100,7 +100,7 @@ class ForumSerializer extends AbstractSerializer
         return $attributes;
     }
 
-    protected function groups($model): ?Relationship
+    protected function groups(array $model): ?Relationship
     {
         return $this->hasMany($model, GroupSerializer::class);
     }
@@ -119,12 +119,12 @@ class ForumSerializer extends AbstractSerializer
         return $faviconPath ? $this->getAssetUrl($faviconPath) : null;
     }
 
-    public function getAssetUrl($assetPath): string
+    public function getAssetUrl(string $assetPath): string
     {
         return $this->assetsFilesystem->url($assetPath);
     }
 
-    protected function actor($model): ?Relationship
+    protected function actor(array $model): ?Relationship
     {
         return $this->hasOne($model, CurrentUserSerializer::class);
     }
diff --git a/framework/core/src/Console/Schedule.php b/framework/core/src/Console/Schedule.php
index 37d105e29..ab2be9c97 100644
--- a/framework/core/src/Console/Schedule.php
+++ b/framework/core/src/Console/Schedule.php
@@ -11,6 +11,7 @@ namespace Flarum\Console;
 
 use Flarum\Foundation\Config;
 use Illuminate\Console\Scheduling\Schedule as LaravelSchedule;
+use Illuminate\Contracts\Container\Container;
 use Illuminate\Support\Collection;
 
 class Schedule extends LaravelSchedule
@@ -21,7 +22,7 @@ class Schedule extends LaravelSchedule
         return (new Collection($this->events))->filter->isDue(new class($app) {
             protected Config $config;
 
-            public function __construct($app)
+            public function __construct(Container $app)
             {
                 $this->config = $app->make(Config::class);
             }
diff --git a/framework/core/src/Database/Migration.php b/framework/core/src/Database/Migration.php
index bef6760e8..c926378cf 100644
--- a/framework/core/src/Database/Migration.php
+++ b/framework/core/src/Database/Migration.php
@@ -21,7 +21,7 @@ use Illuminate\Database\Schema\Builder;
  */
 abstract class Migration
 {
-    public static function createTable($name, callable $definition): array
+    public static function createTable(string $name, callable $definition): array
     {
         return [
             'up' => function (Builder $schema) use ($name, $definition) {
@@ -35,7 +35,7 @@ abstract class Migration
         ];
     }
 
-    public static function createTableIfNotExists($name, callable $definition): array
+    public static function createTableIfNotExists(string $name, callable $definition): array
     {
         return [
             'up' => function (Builder $schema) use ($name, $definition) {
@@ -51,7 +51,7 @@ abstract class Migration
         ];
     }
 
-    public static function renameTable($from, $to): array
+    public static function renameTable(string $from, string $to): array
     {
         return [
             'up' => function (Builder $schema) use ($from, $to) {
@@ -63,7 +63,7 @@ abstract class Migration
         ];
     }
 
-    public static function addColumns($tableName, array $columnDefinitions): array
+    public static function addColumns(string $tableName, array $columnDefinitions): array
     {
         return [
             'up' => function (Builder $schema) use ($tableName, $columnDefinitions) {
@@ -82,7 +82,7 @@ abstract class Migration
         ];
     }
 
-    public static function dropColumns($tableName, array $columnDefinitions): array
+    public static function dropColumns(string $tableName, array $columnDefinitions): array
     {
         $inverse = static::addColumns($tableName, $columnDefinitions);
 
@@ -92,12 +92,12 @@ abstract class Migration
         ];
     }
 
-    public static function renameColumn($tableName, $from, $to): array
+    public static function renameColumn(string $tableName, string $from, string $to): array
     {
         return static::renameColumns($tableName, [$from => $to]);
     }
 
-    public static function renameColumns($tableName, array $columnNames): array
+    public static function renameColumns(string $tableName, array $columnNames): array
     {
         return [
             'up' => function (Builder $schema) use ($tableName, $columnNames) {
diff --git a/framework/core/src/Database/ScopeVisibilityTrait.php b/framework/core/src/Database/ScopeVisibilityTrait.php
index 1cbfc3346..a3e3f333b 100644
--- a/framework/core/src/Database/ScopeVisibilityTrait.php
+++ b/framework/core/src/Database/ScopeVisibilityTrait.php
@@ -22,7 +22,7 @@ trait ScopeVisibilityTrait
      */
     protected static array $visibilityScopers = [];
 
-    public static function registerVisibilityScoper($scoper, ?string $ability = null): void
+    public static function registerVisibilityScoper(callable $scoper, ?string $ability = null): void
     {
         $model = static::class;
 
diff --git a/framework/core/src/Discussion/Access/DiscussionPolicy.php b/framework/core/src/Discussion/Access/DiscussionPolicy.php
index e1dfb50e3..3e4099b07 100644
--- a/framework/core/src/Discussion/Access/DiscussionPolicy.php
+++ b/framework/core/src/Discussion/Access/DiscussionPolicy.php
@@ -21,14 +21,16 @@ class DiscussionPolicy extends AbstractPolicy
     ) {
     }
 
-    public function can(User $actor, string $ability)
+    public function can(User $actor, string $ability): ?string
     {
         if ($actor->hasPermission('discussion.'.$ability)) {
             return $this->allow();
         }
+
+        return null;
     }
 
-    public function rename(User $actor, Discussion $discussion)
+    public function rename(User $actor, Discussion $discussion): ?string
     {
         if ($discussion->user_id == $actor->id && $actor->can('reply', $discussion)) {
             $allowRenaming = $this->settings->get('allow_renaming');
@@ -39,9 +41,11 @@ class DiscussionPolicy extends AbstractPolicy
                 return $this->allow();
             }
         }
+
+        return null;
     }
 
-    public function hide(User $actor, Discussion $discussion)
+    public function hide(User $actor, Discussion $discussion): ?string
     {
         if ($discussion->user_id == $actor->id
             && $discussion->participant_count <= 1
@@ -50,5 +54,7 @@ class DiscussionPolicy extends AbstractPolicy
         ) {
             return $this->allow();
         }
+
+        return null;
     }
 }
diff --git a/framework/core/src/Discussion/Command/EditDiscussion.php b/framework/core/src/Discussion/Command/EditDiscussion.php
index b3dfabc7a..e49a1bd51 100644
--- a/framework/core/src/Discussion/Command/EditDiscussion.php
+++ b/framework/core/src/Discussion/Command/EditDiscussion.php
@@ -14,7 +14,7 @@ use Flarum\User\User;
 class EditDiscussion
 {
     public function __construct(
-        public $discussionId,
+        public int $discussionId,
         public User $actor,
         public array $data
     ) {
diff --git a/framework/core/src/Discussion/Command/ReadDiscussion.php b/framework/core/src/Discussion/Command/ReadDiscussion.php
index 9963bdb52..a8220e250 100644
--- a/framework/core/src/Discussion/Command/ReadDiscussion.php
+++ b/framework/core/src/Discussion/Command/ReadDiscussion.php
@@ -14,11 +14,11 @@ use Flarum\User\User;
 class ReadDiscussion
 {
     public function __construct(
-        public $discussionId,
+        public int $discussionId,
         /** The user to mark the discussion as read for */
         public User $actor,
         /**  The number of the post to mark as read */
-        public $lastReadPostNumber
+        public int $lastReadPostNumber
     ) {
     }
 }
diff --git a/framework/core/src/Discussion/Query/AuthorFilterGambit.php b/framework/core/src/Discussion/Query/AuthorFilterGambit.php
index 7d804be75..16919ff2a 100644
--- a/framework/core/src/Discussion/Query/AuthorFilterGambit.php
+++ b/framework/core/src/Discussion/Query/AuthorFilterGambit.php
@@ -46,7 +46,7 @@ class AuthorFilterGambit extends AbstractRegexGambit implements FilterInterface
         $this->constrain($filterState->getQuery(), $filterValue, $negate);
     }
 
-    protected function constrain(Builder $query, string|array $rawUsernames, $negate)
+    protected function constrain(Builder $query, string|array $rawUsernames, bool $negate): void
     {
         $usernames = $this->asStringArray($rawUsernames);
 
diff --git a/framework/core/src/Discussion/Query/CreatedFilterGambit.php b/framework/core/src/Discussion/Query/CreatedFilterGambit.php
index ad4d36d3a..7d5a98a6b 100644
--- a/framework/core/src/Discussion/Query/CreatedFilterGambit.php
+++ b/framework/core/src/Discussion/Query/CreatedFilterGambit.php
@@ -45,7 +45,7 @@ class CreatedFilterGambit extends AbstractRegexGambit implements FilterInterface
         $this->constrain($filterState->getQuery(), Arr::get($matches, 1), Arr::get($matches, 3), $negate);
     }
 
-    public function constrain(Builder $query, ?string $firstDate, ?string $secondDate, $negate)
+    public function constrain(Builder $query, ?string $firstDate, ?string $secondDate, bool $negate): void
     {
         // If we've just been provided with a single YYYY-MM-DD date, then find
         // discussions that were started on that exact date. But if we've been
diff --git a/framework/core/src/Discussion/Query/HiddenFilterGambit.php b/framework/core/src/Discussion/Query/HiddenFilterGambit.php
index a5e88ebb7..d0bebdf95 100644
--- a/framework/core/src/Discussion/Query/HiddenFilterGambit.php
+++ b/framework/core/src/Discussion/Query/HiddenFilterGambit.php
@@ -37,7 +37,7 @@ class HiddenFilterGambit extends AbstractRegexGambit implements FilterInterface
         $this->constrain($filterState->getQuery(), $negate);
     }
 
-    protected function constrain(Builder $query, bool $negate)
+    protected function constrain(Builder $query, bool $negate): void
     {
         $query->where(function ($query) use ($negate) {
             if ($negate) {
diff --git a/framework/core/src/Discussion/Query/UnreadFilterGambit.php b/framework/core/src/Discussion/Query/UnreadFilterGambit.php
index 2a25a0ea5..5709681e3 100644
--- a/framework/core/src/Discussion/Query/UnreadFilterGambit.php
+++ b/framework/core/src/Discussion/Query/UnreadFilterGambit.php
@@ -52,7 +52,7 @@ class UnreadFilterGambit extends AbstractRegexGambit implements FilterInterface
         $this->constrain($filterState->getQuery(), $filterState->getActor(), $negate);
     }
 
-    protected function constrain(Builder $query, User $actor, bool $negate)
+    protected function constrain(Builder $query, User $actor, bool $negate): void
     {
         if ($actor->exists) {
             $readIds = $this->discussions->getReadIdsQuery($actor);
diff --git a/framework/core/src/Extend/Console.php b/framework/core/src/Extend/Console.php
index 40492c2cc..741890465 100644
--- a/framework/core/src/Extend/Console.php
+++ b/framework/core/src/Extend/Console.php
@@ -43,7 +43,7 @@ class Console implements ExtenderInterface
      * The callback should apply relevant methods to $event, and does not need to return anything.
      *
      * @see https://laravel.com/api/8.x/Illuminate/Console/Scheduling/Event.html
-     * @see https://laravel.com/docs/8.x/scheduling#schedule-frequency-options
+     * @see https://laravel.com/docs/10.x/scheduling#schedule-frequency-options
      * for more information on available methods and what they do.
      *
      * @param array $args An array of args to call the command with.
diff --git a/framework/core/src/Extend/Event.php b/framework/core/src/Extend/Event.php
index 07b8b6eac..a7092081e 100644
--- a/framework/core/src/Extend/Event.php
+++ b/framework/core/src/Extend/Event.php
@@ -44,7 +44,7 @@ class Event implements ExtenderInterface
      * Event subscribers are classes that may subscribe to multiple events from within the subscriber class itself,
      * allowing you to define several event handlers within a single class.
      *
-     * @see https://laravel.com/docs/8.x/events#writing-event-subscribers
+     * @see https://laravel.com/docs/10.x/events#writing-event-subscribers
      *
      * @param string $subscriber: The ::class attribute of the subscriber class.
      * @return self
diff --git a/framework/core/src/Extend/Filesystem.php b/framework/core/src/Extend/Filesystem.php
index fa49162e5..f1bd90fc6 100644
--- a/framework/core/src/Extend/Filesystem.php
+++ b/framework/core/src/Extend/Filesystem.php
@@ -51,7 +51,7 @@ class Filesystem implements ExtenderInterface
      *   });
      * ```
      *
-     * @see https://laravel.com/docs/8.x/filesystem#configuration
+     * @see https://laravel.com/docs/10.x/filesystem#configuration
      *
      * @return self
      */
diff --git a/framework/core/src/Extend/LanguagePack.php b/framework/core/src/Extend/LanguagePack.php
index eeafd126a..18bdc1044 100644
--- a/framework/core/src/Extend/LanguagePack.php
+++ b/framework/core/src/Extend/LanguagePack.php
@@ -61,7 +61,7 @@ class LanguagePack implements ExtenderInterface, LifecycleInterface
         );
     }
 
-    private function registerLocale(Container $container, LocaleManager $locales, Extension $extension, $locale, $title): void
+    private function registerLocale(Container $container, LocaleManager $locales, Extension $extension, string $locale, string $title): void
     {
         $locales->addLocale($locale, $title);
 
diff --git a/framework/core/src/Extend/Model.php b/framework/core/src/Extend/Model.php
index e1f4229f0..363973be5 100644
--- a/framework/core/src/Extend/Model.php
+++ b/framework/core/src/Extend/Model.php
@@ -48,7 +48,7 @@ class Model implements ExtenderInterface
      * Add a custom attribute type cast. Should not be applied to non-extension attributes.
      *
      * @param string $attribute: The new attribute name.
-     * @param string $cast: The cast type. See https://laravel.com/docs/8.x/eloquent-mutators#attribute-casting
+     * @param string $cast: The cast type. See https://laravel.com/docs/10.x/eloquent-mutators#attribute-casting
      * @return self
      */
     public function cast(string $attribute, string $cast): self
diff --git a/framework/core/src/Extend/ModelPrivate.php b/framework/core/src/Extend/ModelPrivate.php
index 3eb378e20..5b44b0f29 100644
--- a/framework/core/src/Extend/ModelPrivate.php
+++ b/framework/core/src/Extend/ModelPrivate.php
@@ -34,7 +34,7 @@ use Illuminate\Contracts\Container\Container;
  */
 class ModelPrivate implements ExtenderInterface
 {
-    private $checkers = [];
+    private array $checkers = [];
 
     /**
      * @param class-string<AbstractModel> $modelClass: The ::class attribute of the model you are applying private checkers to.
diff --git a/framework/core/src/Extend/Routes.php b/framework/core/src/Extend/Routes.php
index a5b12449b..fd1b5950c 100644
--- a/framework/core/src/Extend/Routes.php
+++ b/framework/core/src/Extend/Routes.php
@@ -148,7 +148,7 @@ class Routes implements ExtenderInterface
         return $this->route('DELETE', $path, $name, $handler);
     }
 
-    private function route(string $httpMethod, string $path, string $name, $handler): self
+    private function route(string $httpMethod, string $path, string $name, callable|string $handler): self
     {
         $this->routes[] = [
             'method' => $httpMethod,
diff --git a/framework/core/src/Extension/Exception/ExtensionBootError.php b/framework/core/src/Extension/Exception/ExtensionBootError.php
index c5c126d55..ee7a9657d 100644
--- a/framework/core/src/Extension/Exception/ExtensionBootError.php
+++ b/framework/core/src/Extension/Exception/ExtensionBootError.php
@@ -17,7 +17,7 @@ class ExtensionBootError extends Exception
 {
     public function __construct(
         public Extension $extension,
-        public $extender,
+        public object $extender,
         Throwable $previous = null
     ) {
         $extenderClass = get_class($extender);
diff --git a/framework/core/src/Extension/Extension.php b/framework/core/src/Extension/Extension.php
index e3e7dc464..786c61bbf 100644
--- a/framework/core/src/Extension/Extension.php
+++ b/framework/core/src/Extension/Extension.php
@@ -84,7 +84,7 @@ class Extension implements Arrayable
         $this->assignId();
     }
 
-    protected static function nameToId($name): string
+    protected static function nameToId(string $name): string
     {
         [$vendor, $package] = explode('/', $name);
         $package = str_replace(['flarum-ext-', 'flarum-'], '', $package);
@@ -114,12 +114,12 @@ class Extension implements Arrayable
         }
     }
 
-    public function __get($name)
+    public function __get(string $name): mixed
     {
         return $this->composerJsonAttribute(Str::snake($name, '-'));
     }
 
-    public function __isset($name)
+    public function __isset(string $name): bool
     {
         return isset($this->{$name}) || $this->composerJsonAttribute(Str::snake($name, '-'));
     }
@@ -127,12 +127,9 @@ class Extension implements Arrayable
     /**
      * Dot notation getter for composer.json attributes.
      *
-     * @see https://laravel.com/docs/8.x/helpers#arrays
-     *
-     * @param $name
-     * @return mixed
+     * @see https://laravel.com/docs/10.x/helpers#arrays
      */
-    public function composerJsonAttribute($name): mixed
+    public function composerJsonAttribute(string $name): mixed
     {
         return Arr::get($this->composerJson, $name);
     }
@@ -433,7 +430,7 @@ class Extension implements Arrayable
     /**
      * @internal
      */
-    public function migrate(Migrator $migrator, $direction = 'up'): ?int
+    public function migrate(Migrator $migrator, string $direction = 'up'): ?int
     {
         if (! $this->hasMigrations()) {
             return null;
diff --git a/framework/core/src/Filter/ValidateFilterTrait.php b/framework/core/src/Filter/ValidateFilterTrait.php
index ae8ac42c2..7c496105e 100644
--- a/framework/core/src/Filter/ValidateFilterTrait.php
+++ b/framework/core/src/Filter/ValidateFilterTrait.php
@@ -18,7 +18,7 @@ trait ValidateFilterTrait
      * @throws FlarumValidationException
      * @return array<string>|array<array>
      */
-    protected function asStringArray($filterValue, bool $multidimensional = false): array
+    protected function asStringArray(string|array $filterValue, bool $multidimensional = false): array
     {
         if (is_array($filterValue)) {
             $value = array_map(function ($subValue) use ($multidimensional) {
@@ -40,7 +40,7 @@ trait ValidateFilterTrait
     /**
      * @throws FlarumValidationException
      */
-    protected function asString($filterValue): string
+    protected function asString(string|array $filterValue): string
     {
         if (is_array($filterValue)) {
             $this->throwValidationException('core.api.invalid_filter_type.must_not_be_array_message');
@@ -52,7 +52,7 @@ trait ValidateFilterTrait
     /**
      * @throws FlarumValidationException
      */
-    protected function asInt($filterValue): int
+    protected function asInt(string|array $filterValue): int
     {
         if (! is_numeric($filterValue)) {
             $this->throwValidationException('core.api.invalid_filter_type.must_be_numeric_message');
@@ -65,7 +65,7 @@ trait ValidateFilterTrait
      * @throws FlarumValidationException
      * @return array<int>
      */
-    protected function asIntArray($filterValue): array
+    protected function asIntArray(string|array $filterValue): array
     {
         return array_map(function ($value) {
             return $this->asInt($value);
@@ -75,7 +75,7 @@ trait ValidateFilterTrait
     /**
      * @throws FlarumValidationException
      */
-    protected function asBool($filterValue): bool
+    protected function asBool(string|array $filterValue): bool
     {
         return $this->asString($filterValue) === '1';
     }
diff --git a/framework/core/src/Formatter/Formatter.php b/framework/core/src/Formatter/Formatter.php
index af2ed15b4..4f9e0ed12 100644
--- a/framework/core/src/Formatter/Formatter.php
+++ b/framework/core/src/Formatter/Formatter.php
@@ -94,7 +94,7 @@ class Formatter
         return $renderer->render($xml);
     }
 
-    public function unparse(string $xml, $context = null): string
+    public function unparse(string $xml, mixed $context = null): string
     {
         foreach ($this->unparsingCallbacks as $callback) {
             $xml = $callback($context, $xml);
diff --git a/framework/core/src/Forum/Auth/Registration.php b/framework/core/src/Forum/Auth/Registration.php
index 2d24d3aa7..062367c09 100644
--- a/framework/core/src/Forum/Auth/Registration.php
+++ b/framework/core/src/Forum/Auth/Registration.php
@@ -66,7 +66,7 @@ class Registration
         return $this->suggest('email', $email);
     }
 
-    public function setPayload($payload): self
+    public function setPayload(mixed $payload): self
     {
         $this->payload = $payload;
 
diff --git a/framework/core/src/Forum/Content/Discussion.php b/framework/core/src/Forum/Content/Discussion.php
index 40533edec..5c49cadbf 100644
--- a/framework/core/src/Forum/Content/Discussion.php
+++ b/framework/core/src/Forum/Content/Discussion.php
@@ -92,7 +92,7 @@ class Discussion
      *
      * @throws RouteNotFoundException
      */
-    protected function getApiDocument(Request $request, string $id, array $params)
+    protected function getApiDocument(Request $request, string $id, array $params): object
     {
         $params['bySlug'] = true;
         $response = $this->api
diff --git a/framework/core/src/Forum/Content/User.php b/framework/core/src/Forum/Content/User.php
index 08ebffde7..cbd46140a 100644
--- a/framework/core/src/Forum/Content/User.php
+++ b/framework/core/src/Forum/Content/User.php
@@ -44,7 +44,7 @@ class User
      *
      * @throws ModelNotFoundException
      */
-    protected function getApiDocument(Request $request, string $username)
+    protected function getApiDocument(Request $request, string $username): object
     {
         $response = $this->api->withParentRequest($request)->withQueryParams(['bySlug' => true])->get("/users/$username");
         $statusCode = $response->getStatusCode();
diff --git a/framework/core/src/Foundation/AbstractValidator.php b/framework/core/src/Foundation/AbstractValidator.php
index fc04a263c..84470f6c1 100644
--- a/framework/core/src/Foundation/AbstractValidator.php
+++ b/framework/core/src/Foundation/AbstractValidator.php
@@ -33,7 +33,7 @@ abstract class AbstractValidator
     ) {
     }
 
-    public function addConfiguration($callable): void
+    public function addConfiguration(callable $callable): void
     {
         $this->configuration[] = $callable;
     }
diff --git a/framework/core/src/Foundation/Config.php b/framework/core/src/Foundation/Config.php
index ec20e4cfd..c81679394 100644
--- a/framework/core/src/Foundation/Config.php
+++ b/framework/core/src/Foundation/Config.php
@@ -39,7 +39,7 @@ class Config implements ArrayAccess
         return $this->data['offline'] ?? false;
     }
 
-    private function requireKeys(...$keys): void
+    private function requireKeys(mixed ...$keys): void
     {
         foreach ($keys as $key) {
             if (! array_key_exists($key, $this->data)) {
diff --git a/framework/core/src/Foundation/Container.php b/framework/core/src/Foundation/Container.php
index 20998c8cf..04ad0be5e 100644
--- a/framework/core/src/Foundation/Container.php
+++ b/framework/core/src/Foundation/Container.php
@@ -20,7 +20,7 @@ class Container extends LaravelContainer
      *
      * @TODO: Implement the Application contract and merge the container into it.
      */
-    public function __call(string $name, array $arguments)
+    public function __call(string $name, array $arguments): mixed
     {
         return $this->get('flarum')->$name(...$arguments);
     }
diff --git a/framework/core/src/Foundation/DispatchEventsTrait.php b/framework/core/src/Foundation/DispatchEventsTrait.php
index 46917fdfd..5c40079e4 100644
--- a/framework/core/src/Foundation/DispatchEventsTrait.php
+++ b/framework/core/src/Foundation/DispatchEventsTrait.php
@@ -16,8 +16,14 @@ trait DispatchEventsTrait
     /**
      * Dispatch all events for an entity.
      */
-    public function dispatchEventsFor($entity, User $actor = null): void
+    public function dispatchEventsFor(mixed $entity, User $actor = null): void
     {
+        if (! method_exists($entity, 'releaseEvents')) {
+            throw new \InvalidArgumentException(
+                'The entity must use the EventGeneratorTrait trait in order to dispatch events.'
+            );
+        }
+
         foreach ($entity->releaseEvents() as $event) {
             $event->actor = $actor;
 
diff --git a/framework/core/src/Foundation/ErrorHandling/ExceptionHandler/ValidationExceptionHandler.php b/framework/core/src/Foundation/ErrorHandling/ExceptionHandler/ValidationExceptionHandler.php
index 779ca7c7b..cdc8fee06 100644
--- a/framework/core/src/Foundation/ErrorHandling/ExceptionHandler/ValidationExceptionHandler.php
+++ b/framework/core/src/Foundation/ErrorHandling/ExceptionHandler/ValidationExceptionHandler.php
@@ -26,7 +26,7 @@ class ValidationExceptionHandler
         ));
     }
 
-    private function buildDetails(array $messages, $pointer): array
+    private function buildDetails(array $messages, string $pointer): array
     {
         return array_map(function ($path, $detail) use ($pointer) {
             return [
diff --git a/framework/core/src/Foundation/EventGeneratorTrait.php b/framework/core/src/Foundation/EventGeneratorTrait.php
index 19cdcb873..4eb1ade86 100644
--- a/framework/core/src/Foundation/EventGeneratorTrait.php
+++ b/framework/core/src/Foundation/EventGeneratorTrait.php
@@ -13,10 +13,7 @@ trait EventGeneratorTrait
 {
     protected array $pendingEvents = [];
 
-    /**
-     * Raise a new event.
-     */
-    public function raise($event): void
+    public function raise(object $event): void
     {
         $this->pendingEvents[] = $event;
     }
diff --git a/framework/core/src/Foundation/InstalledApp.php b/framework/core/src/Foundation/InstalledApp.php
index 7f04673ad..c794753d6 100644
--- a/framework/core/src/Foundation/InstalledApp.php
+++ b/framework/core/src/Foundation/InstalledApp.php
@@ -83,7 +83,7 @@ class InstalledApp implements AppInterface
         return $this->config->url()->getPath() ?: '/';
     }
 
-    protected function subPath($pathName): string
+    protected function subPath(string $pathName): string
     {
         return '/'.($this->config['paths'][$pathName] ?? $pathName);
     }
diff --git a/framework/core/src/Foundation/Paths.php b/framework/core/src/Foundation/Paths.php
index c40198397..59fdcaaca 100644
--- a/framework/core/src/Foundation/Paths.php
+++ b/framework/core/src/Foundation/Paths.php
@@ -37,7 +37,7 @@ class Paths
         $this->paths['vendor'] = $this->vendor ?? $this->base.'/vendor';
     }
 
-    public function __get($name): ?string
+    public function __get(string $name): ?string
     {
         return $this->paths[$name] ?? null;
     }
diff --git a/framework/core/src/Foundation/Site.php b/framework/core/src/Foundation/Site.php
index c127587eb..3eca6db0e 100644
--- a/framework/core/src/Foundation/Site.php
+++ b/framework/core/src/Foundation/Site.php
@@ -34,12 +34,12 @@ class Site
         )->extendWith(static::loadExtenders($paths->base));
     }
 
-    protected static function hasConfigFile($basePath): bool
+    protected static function hasConfigFile(string $basePath): bool
     {
         return file_exists("$basePath/config.php");
     }
 
-    protected static function loadConfig($basePath): Config
+    protected static function loadConfig(string $basePath): Config
     {
         $config = include "$basePath/config.php";
 
@@ -50,7 +50,7 @@ class Site
         return new Config($config);
     }
 
-    protected static function loadExtenders($basePath): array
+    protected static function loadExtenders(string $basePath): array
     {
         $extenderFile = "$basePath/extend.php";
 
diff --git a/framework/core/src/Frontend/Assets.php b/framework/core/src/Frontend/Assets.php
index 9a6abf6b3..63415a919 100644
--- a/framework/core/src/Frontend/Assets.php
+++ b/framework/core/src/Frontend/Assets.php
@@ -44,35 +44,35 @@ class Assets
     ) {
     }
 
-    public function js($sources): static
+    public function js(callable $callback): static
     {
-        $this->addSources('js', $sources);
+        $this->addSources('js', $callback);
 
         return $this;
     }
 
-    public function css($callback): static
+    public function css(callable $callback): static
     {
         $this->addSources('css', $callback);
 
         return $this;
     }
 
-    public function localeJs($callback): static
+    public function localeJs(callable $callback): static
     {
         $this->addSources('localeJs', $callback);
 
         return $this;
     }
 
-    public function localeCss($callback): static
+    public function localeCss(callable $callback): static
     {
         $this->addSources('localeCss', $callback);
 
         return $this;
     }
 
-    private function addSources($type, $callback): void
+    private function addSources(string $type, callable $callback): void
     {
         $this->sources[$type][] = $callback;
     }
@@ -122,7 +122,7 @@ class Assets
         return $compiler;
     }
 
-    protected function makeJsCompiler(string $filename)
+    protected function makeJsCompiler(string $filename): JsCompiler
     {
         return resolve(JsCompiler::class, [
             'assetsDir' => $this->assetsDir,
@@ -163,7 +163,7 @@ class Assets
         return $this->name;
     }
 
-    public function setName(string $name)
+    public function setName(string $name): void
     {
         $this->name = $name;
     }
@@ -173,7 +173,7 @@ class Assets
         return $this->assetsDir;
     }
 
-    public function setAssetsDir(Cloud $assetsDir)
+    public function setAssetsDir(Cloud $assetsDir): void
     {
         $this->assetsDir = $assetsDir;
     }
@@ -183,7 +183,7 @@ class Assets
         return $this->cacheDir;
     }
 
-    public function setCacheDir(?string $cacheDir)
+    public function setCacheDir(?string $cacheDir): void
     {
         $this->cacheDir = $cacheDir;
     }
@@ -193,17 +193,17 @@ class Assets
         return $this->lessImportDirs;
     }
 
-    public function setLessImportDirs(array $lessImportDirs)
+    public function setLessImportDirs(array $lessImportDirs): void
     {
         $this->lessImportDirs = $lessImportDirs;
     }
 
-    public function addLessImportOverrides(array $lessImportOverrides)
+    public function addLessImportOverrides(array $lessImportOverrides): void
     {
         $this->lessImportOverrides = array_merge($this->lessImportOverrides, $lessImportOverrides);
     }
 
-    public function addFileSourceOverrides(array $fileSourceOverrides)
+    public function addFileSourceOverrides(array $fileSourceOverrides): void
     {
         $this->fileSourceOverrides = array_merge($this->fileSourceOverrides, $fileSourceOverrides);
     }
diff --git a/framework/core/src/Frontend/Compiler/VersionerInterface.php b/framework/core/src/Frontend/Compiler/VersionerInterface.php
index ad5dae42e..13cd5324f 100644
--- a/framework/core/src/Frontend/Compiler/VersionerInterface.php
+++ b/framework/core/src/Frontend/Compiler/VersionerInterface.php
@@ -11,7 +11,7 @@ namespace Flarum\Frontend\Compiler;
 
 interface VersionerInterface
 {
-    public function putRevision(string $file, ?string $revision);
+    public function putRevision(string $file, ?string $revision): void;
 
     public function getRevision(string $file): ?string;
 }
diff --git a/framework/core/src/Frontend/FrontendServiceProvider.php b/framework/core/src/Frontend/FrontendServiceProvider.php
index 4f51d3441..4b3b01588 100644
--- a/framework/core/src/Frontend/FrontendServiceProvider.php
+++ b/framework/core/src/Frontend/FrontendServiceProvider.php
@@ -40,8 +40,8 @@ class FrontendServiceProvider extends AbstractServiceProvider
                     $paths->vendor.'/components/font-awesome/less' => ''
                 ]);
 
-                $assets->css([$this, 'addBaseCss']);
-                $assets->localeCss([$this, 'addBaseCss']);
+                $assets->css($this->addBaseCss(...));
+                $assets->localeCss($this->addBaseCss(...));
 
                 return $assets;
             };
diff --git a/framework/core/src/Group/Access/GroupPolicy.php b/framework/core/src/Group/Access/GroupPolicy.php
index cff5c4749..19189a490 100644
--- a/framework/core/src/Group/Access/GroupPolicy.php
+++ b/framework/core/src/Group/Access/GroupPolicy.php
@@ -14,10 +14,12 @@ use Flarum\User\User;
 
 class GroupPolicy extends AbstractPolicy
 {
-    public function can(User $actor, string $ability)
+    public function can(User $actor, string $ability): ?string
     {
         if ($actor->hasPermission('group.'.$ability)) {
             return $this->allow();
         }
+
+        return null;
     }
 }
diff --git a/framework/core/src/Http/Access/AccessTokenPolicy.php b/framework/core/src/Http/Access/AccessTokenPolicy.php
index 5346ae627..fc7419536 100644
--- a/framework/core/src/Http/Access/AccessTokenPolicy.php
+++ b/framework/core/src/Http/Access/AccessTokenPolicy.php
@@ -15,10 +15,12 @@ use Flarum\User\User;
 
 class AccessTokenPolicy extends AbstractPolicy
 {
-    public function revoke(User $actor, AccessToken $token)
+    public function revoke(User $actor, AccessToken $token): ?string
     {
         if ($token->user_id === $actor->id || $actor->hasPermission('moderateAccessTokens')) {
             return $this->allow();
         }
+
+        return null;
     }
 }
diff --git a/framework/core/src/Http/Middleware/AuthenticateWithHeader.php b/framework/core/src/Http/Middleware/AuthenticateWithHeader.php
index 27b346df5..bce59949b 100644
--- a/framework/core/src/Http/Middleware/AuthenticateWithHeader.php
+++ b/framework/core/src/Http/Middleware/AuthenticateWithHeader.php
@@ -58,7 +58,7 @@ class AuthenticateWithHeader implements Middleware
         return $handler->handle($request);
     }
 
-    private function getUser($string): ?User
+    private function getUser(string $string): ?User
     {
         $parts = explode('=', trim($string));
 
diff --git a/framework/core/src/Http/RouteCollection.php b/framework/core/src/Http/RouteCollection.php
index a27640441..9d20e22e0 100644
--- a/framework/core/src/Http/RouteCollection.php
+++ b/framework/core/src/Http/RouteCollection.php
@@ -30,32 +30,32 @@ class RouteCollection
         $this->routeParser = new RouteParser\Std;
     }
 
-    public function get($path, $name, $handler): self
+    public function get(string $path, string $name, callable|string $handler): self
     {
         return $this->addRoute('GET', $path, $name, $handler);
     }
 
-    public function post($path, $name, $handler): self
+    public function post(string $path, string $name, callable|string $handler): self
     {
         return $this->addRoute('POST', $path, $name, $handler);
     }
 
-    public function put($path, $name, $handler): self
+    public function put(string $path, string $name, callable|string $handler): self
     {
         return $this->addRoute('PUT', $path, $name, $handler);
     }
 
-    public function patch($path, $name, $handler): self
+    public function patch(string $path, string $name, callable|string $handler): self
     {
         return $this->addRoute('PATCH', $path, $name, $handler);
     }
 
-    public function delete($path, $name, $handler): self
+    public function delete(string $path, string $name, callable|string $handler): self
     {
         return $this->addRoute('DELETE', $path, $name, $handler);
     }
 
-    public function addRoute($method, $path, $name, $handler): self
+    public function addRoute(string $method, string $path, string $name, callable|string $handler): self
     {
         if (isset($this->routes[$name])) {
             throw new \RuntimeException("Route $name already exists");
@@ -102,7 +102,7 @@ class RouteCollection
         return $this->dataGenerator->getData();
     }
 
-    protected function fixPathPart(mixed $part, array $parameters, string $routeName)
+    protected function fixPathPart(mixed $part, array $parameters, string $routeName): string
     {
         if (! is_array($part)) {
             return $part;
diff --git a/framework/core/src/Http/RouteHandlerFactory.php b/framework/core/src/Http/RouteHandlerFactory.php
index ea45c3b8b..eef4d5db8 100644
--- a/framework/core/src/Http/RouteHandlerFactory.php
+++ b/framework/core/src/Http/RouteHandlerFactory.php
@@ -26,7 +26,7 @@ class RouteHandlerFactory
     ) {
     }
 
-    public function toController($controller): Closure
+    public function toController(callable|string $controller): Closure
     {
         return function (Request $request, array $routeParams) use ($controller) {
             $controller = $this->resolveController($controller);
@@ -60,7 +60,7 @@ class RouteHandlerFactory
         return $this->toFrontend('admin', $content);
     }
 
-    private function resolveController($controller): Handler
+    private function resolveController(callable|string $controller): Handler
     {
         if (is_callable($controller)) {
             $controller = $this->container->call($controller);
diff --git a/framework/core/src/Http/Server.php b/framework/core/src/Http/Server.php
index c872d05f1..4fff8e0a0 100644
--- a/framework/core/src/Http/Server.php
+++ b/framework/core/src/Http/Server.php
@@ -52,7 +52,7 @@ class Server
      *
      * @throws Throwable
      */
-    private function safelyBootAndGetHandler()
+    private function safelyBootAndGetHandler() // @phpstan-ignore-line
     {
         try {
             return $this->site->bootApp()->getRequestHandler();
diff --git a/framework/core/src/Install/Console/InstallCommand.php b/framework/core/src/Install/Console/InstallCommand.php
index 8c98eb376..d75b4d1de 100644
--- a/framework/core/src/Install/Console/InstallCommand.php
+++ b/framework/core/src/Install/Console/InstallCommand.php
@@ -103,7 +103,7 @@ class InstallCommand extends AbstractCommand
             ->run();
     }
 
-    protected function showProblems($problems): void
+    protected function showProblems(iterable $problems): void
     {
         $this->output->writeln(
             '<error>Please fix the following problems before we can continue with the installation.</error>'
diff --git a/framework/core/src/Install/Console/UserDataProvider.php b/framework/core/src/Install/Console/UserDataProvider.php
index 38cecf7fa..f72b55bb7 100644
--- a/framework/core/src/Install/Console/UserDataProvider.php
+++ b/framework/core/src/Install/Console/UserDataProvider.php
@@ -76,7 +76,7 @@ class UserDataProvider implements DataProviderInterface
         );
     }
 
-    private function askForAdminPassword()
+    private function askForAdminPassword(): string
     {
         while (true) {
             $password = $this->secret('Admin password (required >= 8 characters):');
@@ -108,14 +108,14 @@ class UserDataProvider implements DataProviderInterface
         ];
     }
 
-    private function ask($question, $default = null): mixed
+    private function ask(string $question, string $default = null): mixed
     {
         $question = new Question("<question>$question</question> ", $default);
 
         return $this->questionHelper->ask($this->input, $this->output, $question);
     }
 
-    private function secret($question): mixed
+    private function secret(string $question): mixed
     {
         $question = new Question("<question>$question</question> ");
 
@@ -124,7 +124,7 @@ class UserDataProvider implements DataProviderInterface
         return $this->questionHelper->ask($this->input, $this->output, $question);
     }
 
-    private function validationError($message): void
+    private function validationError(string $message): void
     {
         $this->output->writeln("<error>$message</error>");
         $this->output->writeln('Please try again.');
diff --git a/framework/core/src/Install/Pipeline.php b/framework/core/src/Install/Pipeline.php
index 21a5fa571..1af323ec5 100644
--- a/framework/core/src/Install/Pipeline.php
+++ b/framework/core/src/Install/Pipeline.php
@@ -33,7 +33,7 @@ class Pipeline
         return $this;
     }
 
-    public function on($event, callable $callback): self
+    public function on(string $event, callable $callback): self
     {
         $this->callbacks[$event] = $callback;
 
@@ -88,7 +88,7 @@ class Pipeline
         }
     }
 
-    private function fireCallbacks($event, Step $step): void
+    private function fireCallbacks(string $event, Step $step): void
     {
         if (isset($this->callbacks[$event])) {
             ($this->callbacks[$event])($step);
diff --git a/framework/core/src/Install/Prerequisite/WritablePaths.php b/framework/core/src/Install/Prerequisite/WritablePaths.php
index b5fb8a86d..91ca12190 100644
--- a/framework/core/src/Install/Prerequisite/WritablePaths.php
+++ b/framework/core/src/Install/Prerequisite/WritablePaths.php
@@ -54,7 +54,7 @@ class WritablePaths implements PrerequisiteInterface
             });
     }
 
-    private function getAbsolutePath($path)
+    private function getAbsolutePath(string $path): string
     {
         $path = str_replace(['/', '\\'], DIRECTORY_SEPARATOR, $path);
         $parts = array_filter(explode(DIRECTORY_SEPARATOR, $path), 'strlen');
diff --git a/framework/core/src/Locale/LocaleManager.php b/framework/core/src/Locale/LocaleManager.php
index 36e14d749..2bae99c86 100644
--- a/framework/core/src/Locale/LocaleManager.php
+++ b/framework/core/src/Locale/LocaleManager.php
@@ -49,7 +49,7 @@ class LocaleManager
         return isset($this->locales[$locale]);
     }
 
-    public function addTranslations(string $locale, $file, string $module = null): void
+    public function addTranslations(string $locale, string $file, string $module = null): void
     {
         $prefix = $module ? $module.'::' : '';
 
diff --git a/framework/core/src/Locale/PrefixedYamlFileLoader.php b/framework/core/src/Locale/PrefixedYamlFileLoader.php
index 20f69a4d4..528a05aff 100644
--- a/framework/core/src/Locale/PrefixedYamlFileLoader.php
+++ b/framework/core/src/Locale/PrefixedYamlFileLoader.php
@@ -14,7 +14,7 @@ use Symfony\Component\Translation\MessageCatalogue;
 
 class PrefixedYamlFileLoader extends YamlFileLoader
 {
-    public function load(mixed $resource, $locale, $domain = 'messages'): MessageCatalogue
+    public function load(mixed $resource, string $locale, string $domain = 'messages'): MessageCatalogue
     {
         $catalogue = parent::load($resource['file'], $locale, $domain);
 
diff --git a/framework/core/src/Post/Access/PostPolicy.php b/framework/core/src/Post/Access/PostPolicy.php
index 839fa57a2..2171f1f55 100644
--- a/framework/core/src/Post/Access/PostPolicy.php
+++ b/framework/core/src/Post/Access/PostPolicy.php
@@ -22,14 +22,16 @@ class PostPolicy extends AbstractPolicy
     ) {
     }
 
-    public function can(User $actor, string $ability, Post $post)
+    public function can(User $actor, string $ability, Post $post): ?string
     {
         if ($actor->can($ability.'Posts', $post->discussion)) {
             return $this->allow();
         }
+
+        return null;
     }
 
-    public function edit(User $actor, Post $post)
+    public function edit(User $actor, Post $post): ?string
     {
         // A post is allowed to be edited if the user is the author, the post
         // hasn't been deleted by someone else, and the user is allowed to
@@ -43,9 +45,11 @@ class PostPolicy extends AbstractPolicy
                 return $this->allow();
             }
         }
+
+        return null;
     }
 
-    public function hide(User $actor, Post $post)
+    public function hide(User $actor, Post $post): ?string
     {
         if ($post->user_id == $actor->id && (! $post->hidden_at || $post->hidden_user_id == $actor->id) && $actor->can('reply', $post->discussion)) {
             $allowHiding = $this->settings->get('allow_hide_own_posts');
@@ -56,5 +60,7 @@ class PostPolicy extends AbstractPolicy
                 return $this->allow();
             }
         }
+
+        return null;
     }
 }
diff --git a/framework/core/src/Queue/QueueServiceProvider.php b/framework/core/src/Queue/QueueServiceProvider.php
index 4d19b30fc..bf7d6fa68 100644
--- a/framework/core/src/Queue/QueueServiceProvider.php
+++ b/framework/core/src/Queue/QueueServiceProvider.php
@@ -16,6 +16,7 @@ use Flarum\Foundation\ErrorHandling\Reporter;
 use Flarum\Foundation\Paths;
 use Illuminate\Container\Container as ContainerImplementation;
 use Illuminate\Contracts\Cache\Factory as CacheFactory;
+use Illuminate\Contracts\Cache\Repository;
 use Illuminate\Contracts\Container\Container;
 use Illuminate\Contracts\Debug\ExceptionHandler as ExceptionHandling;
 use Illuminate\Contracts\Events\Dispatcher;
@@ -91,29 +92,24 @@ class QueueServiceProvider extends AbstractServiceProvider
         // Bind a simple cache manager that returns the cache store.
         $this->container->singleton('cache', function (Container $container) {
             return new class($container) implements CacheFactory {
-                /**
-                 * @var Container
-                 */
-                private $container;
-
-                public function __construct(Container $container)
-                {
-                    $this->container = $container;
+                public function __construct(
+                    private readonly Container $container
+                ) {
                 }
 
-                public function driver()
+                public function driver(): Repository
                 {
                     return $this->container['cache.store'];
                 }
 
                 // We have to define this explicitly
                 // so that we implement the interface.
-                public function store($name = null)
+                public function store($name = null): mixed
                 {
                     return $this->__call($name, null);
                 }
 
-                public function __call($name, $arguments)
+                public function __call(string $name, ?array $arguments): mixed
                 {
                     return call_user_func_array([$this->driver(), $name], $arguments);
                 }
diff --git a/framework/core/src/Settings/DatabaseSettingsRepository.php b/framework/core/src/Settings/DatabaseSettingsRepository.php
index 801d0c7e9..51b05d4fa 100644
--- a/framework/core/src/Settings/DatabaseSettingsRepository.php
+++ b/framework/core/src/Settings/DatabaseSettingsRepository.php
@@ -23,7 +23,7 @@ class DatabaseSettingsRepository implements SettingsRepositoryInterface
         return $this->database->table('settings')->pluck('value', 'key')->all();
     }
 
-    public function get(string $key, $default = null): mixed
+    public function get(string $key, mixed $default = null): mixed
     {
         if (is_null($value = $this->database->table('settings')->where('key', $key)->value('value'))) {
             return $default;
diff --git a/framework/core/src/Settings/DefaultSettingsRepository.php b/framework/core/src/Settings/DefaultSettingsRepository.php
index ee0235fa3..e1b93bbbd 100644
--- a/framework/core/src/Settings/DefaultSettingsRepository.php
+++ b/framework/core/src/Settings/DefaultSettingsRepository.php
@@ -19,7 +19,7 @@ class DefaultSettingsRepository implements SettingsRepositoryInterface
     ) {
     }
 
-    public function get(string $key, $default = null): mixed
+    public function get(string $key, mixed $default = null): mixed
     {
         // Global default overrules local default because local default is deprecated,
         // and will be removed in 2.0
diff --git a/framework/core/src/Settings/MemoryCacheSettingsRepository.php b/framework/core/src/Settings/MemoryCacheSettingsRepository.php
index b045fa123..5f75849f3 100644
--- a/framework/core/src/Settings/MemoryCacheSettingsRepository.php
+++ b/framework/core/src/Settings/MemoryCacheSettingsRepository.php
@@ -31,7 +31,7 @@ class MemoryCacheSettingsRepository implements SettingsRepositoryInterface
         return $this->cache;
     }
 
-    public function get(string $key, $default = null): mixed
+    public function get(string $key, mixed $default = null): mixed
     {
         if (array_key_exists($key, $this->cache)) {
             return $this->cache[$key];
diff --git a/framework/core/src/Settings/OverrideSettingsRepository.php b/framework/core/src/Settings/OverrideSettingsRepository.php
index efc9468ef..4e2f349f0 100644
--- a/framework/core/src/Settings/OverrideSettingsRepository.php
+++ b/framework/core/src/Settings/OverrideSettingsRepository.php
@@ -36,7 +36,7 @@ class OverrideSettingsRepository implements SettingsRepositoryInterface
         return array_merge($this->inner->all(), $this->overrides);
     }
 
-    public function get(string $key, $default = null): mixed
+    public function get(string $key, mixed $default = null): mixed
     {
         if (array_key_exists($key, $this->overrides)) {
             return $this->overrides[$key];
diff --git a/framework/core/src/Settings/SettingsRepositoryInterface.php b/framework/core/src/Settings/SettingsRepositoryInterface.php
index 0c6e4c42f..88926c8d6 100644
--- a/framework/core/src/Settings/SettingsRepositoryInterface.php
+++ b/framework/core/src/Settings/SettingsRepositoryInterface.php
@@ -16,7 +16,7 @@ interface SettingsRepositoryInterface
     /**
      * @todo remove deprecated $default in 2.0
      */
-    public function get(string $key, $default = null): mixed;
+    public function get(string $key, mixed $default = null): mixed;
 
     public function set(string $key, mixed $value): void;
 
diff --git a/framework/core/src/Settings/UninstalledSettingsRepository.php b/framework/core/src/Settings/UninstalledSettingsRepository.php
index e602180af..e1199151e 100644
--- a/framework/core/src/Settings/UninstalledSettingsRepository.php
+++ b/framework/core/src/Settings/UninstalledSettingsRepository.php
@@ -16,7 +16,7 @@ class UninstalledSettingsRepository implements SettingsRepositoryInterface
         return [];
     }
 
-    public function get(string $key, $default = null): mixed
+    public function get(string $key, mixed $default = null): mixed
     {
         return $default;
     }
diff --git a/framework/core/src/User/Access/AbstractPolicy.php b/framework/core/src/User/Access/AbstractPolicy.php
index e1166e006..16bd326cb 100644
--- a/framework/core/src/User/Access/AbstractPolicy.php
+++ b/framework/core/src/User/Access/AbstractPolicy.php
@@ -9,6 +9,7 @@
 
 namespace Flarum\User\Access;
 
+use Flarum\Database\AbstractModel;
 use Flarum\User\User;
 
 abstract class AbstractPolicy
@@ -39,7 +40,7 @@ abstract class AbstractPolicy
         return static::FORCE_DENY;
     }
 
-    public function checkAbility(User $actor, string $ability, $instance)
+    public function checkAbility(User $actor, string $ability, string|AbstractModel|null $instance): ?string
     {
         // If a specific method for this ability is defined,
         // call that and return any non-null results
@@ -55,6 +56,8 @@ abstract class AbstractPolicy
         if (method_exists($this, 'can')) {
             return $this->sanitizeResult(call_user_func_array([$this, 'can'], [$actor, $ability, $instance]));
         }
+
+        return null;
     }
 
     /**
diff --git a/framework/core/src/User/Access/Gate.php b/framework/core/src/User/Access/Gate.php
index 75f01a688..66e1e5771 100644
--- a/framework/core/src/User/Access/Gate.php
+++ b/framework/core/src/User/Access/Gate.php
@@ -46,6 +46,7 @@ class Gate
     public function allows(User $actor, string $ability, string|AbstractModel|null $model): bool
     {
         $results = [];
+        /** @var AbstractPolicy[] $appliedPolicies */
         $appliedPolicies = [];
 
         if ($model) {
diff --git a/framework/core/src/User/Access/UserPolicy.php b/framework/core/src/User/Access/UserPolicy.php
index 2fd137df0..4db006a02 100644
--- a/framework/core/src/User/Access/UserPolicy.php
+++ b/framework/core/src/User/Access/UserPolicy.php
@@ -13,14 +13,16 @@ use Flarum\User\User;
 
 class UserPolicy extends AbstractPolicy
 {
-    public function can(User $actor, string $ability)
+    public function can(User $actor, string $ability): ?string
     {
         if ($actor->hasPermission('user.'.$ability)) {
             return $this->allow();
         }
+
+        return null;
     }
 
-    public function editCredentials(User $actor, User $user)
+    public function editCredentials(User $actor, User $user): ?string
     {
         if ($user->isAdmin() && ! $actor->isAdmin()) {
             return $this->deny();
@@ -29,5 +31,7 @@ class UserPolicy extends AbstractPolicy
         if ($actor->hasPermission('user.editCredentials')) {
             return $this->allow();
         }
+
+        return null;
     }
 }
diff --git a/framework/core/src/User/AvatarValidator.php b/framework/core/src/User/AvatarValidator.php
index 15b237133..615e86b6d 100644
--- a/framework/core/src/User/AvatarValidator.php
+++ b/framework/core/src/User/AvatarValidator.php
@@ -91,7 +91,7 @@ class AvatarValidator extends AbstractValidator
         }
     }
 
-    protected function raise($error, array $parameters = [], $rule = null): void
+    protected function raise(string $error, array $parameters = [], string $rule = null): void
     {
         // When we switched to intl ICU message format, the translation parameters
         // have become required to be in the format `{param}`.
diff --git a/framework/core/src/User/Command/RegisterUserHandler.php b/framework/core/src/User/Command/RegisterUserHandler.php
index 4dc745bc7..88f848382 100644
--- a/framework/core/src/User/Command/RegisterUserHandler.php
+++ b/framework/core/src/User/Command/RegisterUserHandler.php
@@ -96,7 +96,7 @@ class RegisterUserHandler
         return $user;
     }
 
-    private function applyToken(User $user, RegistrationToken $token)
+    private function applyToken(User $user, RegistrationToken $token): void
     {
         foreach ($token->user_attributes as $k => $v) {
             if ($k === 'avatar_url') {
diff --git a/framework/core/src/User/Query/EmailFilterGambit.php b/framework/core/src/User/Query/EmailFilterGambit.php
index 2fa4bb58b..c0028fe84 100644
--- a/framework/core/src/User/Query/EmailFilterGambit.php
+++ b/framework/core/src/User/Query/EmailFilterGambit.php
@@ -53,7 +53,7 @@ class EmailFilterGambit extends AbstractRegexGambit implements FilterInterface
         $this->constrain($filterState->getQuery(), $filterValue, $negate);
     }
 
-    protected function constrain(Builder $query, $rawEmail, bool $negate): void
+    protected function constrain(Builder $query, string|array $rawEmail, bool $negate): void
     {
         $email = $this->asString($rawEmail);
 
diff --git a/framework/core/src/User/Query/GroupFilterGambit.php b/framework/core/src/User/Query/GroupFilterGambit.php
index 39807fba2..ebb118b42 100644
--- a/framework/core/src/User/Query/GroupFilterGambit.php
+++ b/framework/core/src/User/Query/GroupFilterGambit.php
@@ -42,7 +42,7 @@ class GroupFilterGambit extends AbstractRegexGambit implements FilterInterface
         $this->constrain($filterState->getQuery(), $filterState->getActor(), $filterValue, $negate);
     }
 
-    protected function constrain(Builder $query, User $actor, $rawQuery, bool $negate): void
+    protected function constrain(Builder $query, User $actor, string|array $rawQuery, bool $negate): void
     {
         $groupIdentifiers = $this->asStringArray($rawQuery);
         $groupQuery = Group::whereVisibleTo($actor);
diff --git a/framework/core/src/helpers.php b/framework/core/src/helpers.php
index 51aa9acb8..6df8ffa4c 100644
--- a/framework/core/src/helpers.php
+++ b/framework/core/src/helpers.php
@@ -114,7 +114,7 @@ if (! function_exists('config')) {
     /**
      * @deprecated do not use, will be transferred to flarum/laravel-helpers.
      */
-    function config(string $key, $default = null)
+    function config(string $key, mixed $default = null): mixed
     {
         return resolve(Repository::class)->get($key, $default);
     }
diff --git a/phpstan.neon b/phpstan.neon
index 5081c1bac..30392ff54 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -2,7 +2,7 @@ includes:
   - php-packages/phpstan/extension.neon
 
 parameters:
-	level: 5
+	level: 6
 	paths:
 	  - framework/core/src
 	  - extensions/akismet/src
@@ -36,4 +36,5 @@ parameters:
 	excludePaths:
 		- *.blade.php
 	checkMissingIterableValueType: false
+	checkGenericClassInNonGenericObjectType: false
 	databaseMigrationsPath: ['framework/core/migrations']