diff --git a/lib/Doctrine/ORM/Internal/Hydration/AbstractHydrator.php b/lib/Doctrine/ORM/Internal/Hydration/AbstractHydrator.php
index d99413a250d..cd77aa532b8 100644
--- a/lib/Doctrine/ORM/Internal/Hydration/AbstractHydrator.php
+++ b/lib/Doctrine/ORM/Internal/Hydration/AbstractHydrator.php
@@ -537,12 +537,11 @@ protected function registerManaged(ClassMetadata $class, object $entity, array $
     }
 
     /**
-     * @param mixed                    $value
      * @param class-string<BackedEnum> $enumType
      *
      * @return BackedEnum|array<BackedEnum>
      */
-    final protected function buildEnum($value, string $enumType)
+    final protected function buildEnum(mixed $value, string $enumType): BackedEnum|array
     {
         if (is_array($value)) {
             return array_map(
diff --git a/lib/Doctrine/ORM/Mapping/DefaultQuoteStrategy.php b/lib/Doctrine/ORM/Mapping/DefaultQuoteStrategy.php
index 56f654a27e6..86df5209054 100644
--- a/lib/Doctrine/ORM/Mapping/DefaultQuoteStrategy.php
+++ b/lib/Doctrine/ORM/Mapping/DefaultQuoteStrategy.php
@@ -115,11 +115,9 @@ public function getIdentifierColumnNames(ClassMetadata $class, AbstractPlatform
             // Association defined as Id field
             $joinColumns            = $class->associationMappings[$fieldName]['joinColumns'];
             $assocQuotedColumnNames = array_map(
-                static function ($joinColumn) use ($platform) {
-                    return isset($joinColumn['quoted'])
-                        ? $platform->quoteIdentifier($joinColumn['name'])
-                        : $joinColumn['name'];
-                },
+                static fn (array $joinColumn) => isset($joinColumn['quoted'])
+                    ? $platform->quoteIdentifier($joinColumn['name'])
+                    : $joinColumn['name'],
                 $joinColumns,
             );
 
diff --git a/lib/Doctrine/ORM/Mapping/ReflectionEnumProperty.php b/lib/Doctrine/ORM/Mapping/ReflectionEnumProperty.php
index c77f2d04ce9..93680eee10f 100644
--- a/lib/Doctrine/ORM/Mapping/ReflectionEnumProperty.php
+++ b/lib/Doctrine/ORM/Mapping/ReflectionEnumProperty.php
@@ -9,7 +9,6 @@
 use ValueError;
 
 use function array_map;
-use function get_class;
 use function is_array;
 
 final class ReflectionEnumProperty extends ReflectionProperty
@@ -55,9 +54,7 @@ public function setValue(mixed $object, mixed $value = null): void
     {
         if ($value !== null) {
             if (is_array($value)) {
-                $value = array_map(function ($item) use ($object): BackedEnum {
-                    return $this->initializeEnumValue($object, $item);
-                }, $value);
+                $value = array_map(fn (int|string|BackedEnum $item): BackedEnum => $this->initializeEnumValue($object, $item), $value);
             } else {
                 $value = $this->initializeEnumValue($object, $value);
             }
@@ -78,7 +75,7 @@ private function initializeEnumValue(object $object, int|string|BackedEnum $valu
             return $enumType::from($value);
         } catch (ValueError $e) {
             throw MappingException::invalidEnumValue(
-                get_class($object),
+                $object::class,
                 $this->originalReflectionProperty->getName(),
                 (string) $value,
                 $enumType,
diff --git a/lib/Doctrine/ORM/Query/FilterCollection.php b/lib/Doctrine/ORM/Query/FilterCollection.php
index d08c63532f2..6a3e1295e17 100644
--- a/lib/Doctrine/ORM/Query/FilterCollection.php
+++ b/lib/Doctrine/ORM/Query/FilterCollection.php
@@ -29,7 +29,7 @@ class FilterCollection
      */
     public const FILTERS_STATE_DIRTY = 2;
 
-    private Configuration $config;
+    private readonly Configuration $config;
 
     /**
      * Instances of enabled filters.
diff --git a/lib/Doctrine/ORM/Query/ResultSetMappingBuilder.php b/lib/Doctrine/ORM/Query/ResultSetMappingBuilder.php
index 6069488b351..073b8ec8639 100644
--- a/lib/Doctrine/ORM/Query/ResultSetMappingBuilder.php
+++ b/lib/Doctrine/ORM/Query/ResultSetMappingBuilder.php
@@ -10,6 +10,7 @@
 use Doctrine\ORM\Mapping\ClassMetadata;
 use Doctrine\ORM\Utility\PersisterHelper;
 use InvalidArgumentException;
+use Stringable;
 
 use function in_array;
 use function sprintf;
@@ -17,7 +18,7 @@
 /**
  * A ResultSetMappingBuilder uses the EntityManager to automatically populate entity fields.
  */
-class ResultSetMappingBuilder extends ResultSetMapping
+class ResultSetMappingBuilder extends ResultSetMapping implements Stringable
 {
     use SQLResultCasing;
 
diff --git a/lib/Doctrine/ORM/Tools/Pagination/WhereInWalker.php b/lib/Doctrine/ORM/Tools/Pagination/WhereInWalker.php
index 0ee370a0409..50bdf8a14c8 100644
--- a/lib/Doctrine/ORM/Tools/Pagination/WhereInWalker.php
+++ b/lib/Doctrine/ORM/Tools/Pagination/WhereInWalker.php
@@ -146,8 +146,9 @@ private function convertWhereInIdentifiersToDatabaseValue(string $type): void
             ->getEntityManager()
             ->getConnection();
 
-        $query->setParameter(self::PAGINATOR_ID_ALIAS, array_map(static function ($id) use ($connection, $type) {
-            return $connection->convertToDatabaseValue($id, $type);
-        }, $identifiers));
+        $query->setParameter(
+            self::PAGINATOR_ID_ALIAS,
+            array_map(static fn (mixed $id): mixed => $connection->convertToDatabaseValue($id, $type), $identifiers),
+        );
     }
 }