changed array_merge to use NestedArray::mergeDeepArray to preserve numeric keys for integer filter labels

modules/jsonapi_defaults/src/Controller/EntityResource.php

@@ -3,6 +3,7 @@
 namespace Drupal\jsonapi_defaults\Controller;
 
 use Drupal\Component\Serialization\Json;
+use Drupal\Component\Utility\NestedArray;
 use Drupal\jsonapi\Controller\EntityResource as JsonApiEntityResourse;
 use Drupal\jsonapi\Query\OffsetPage;
 use Drupal\jsonapi\Query\Sort;
@@ -12,6 +13,7 @@ use Drupal\jsonapi_extras\Entity\JsonapiResourceConfig;
 use Drupal\jsonapi_extras\ResourceType\ConfigurableResourceType;
 use Symfony\Component\HttpFoundation\Request;
 
+
 /**
  * Overrides jsonapi module EntityResource controller.
  */
@@ -72,10 +74,7 @@ class EntityResource extends JsonApiEntityResourse {
       }
     }
 
-    $filters = array_merge(
-      $default_filter,
-      $request->query->get('filter', [])
-    );
+    $filters = NestedArray::mergeDeepArray([$default_filter, $request->query->get('filter', [])], TRUE);
 
     $sort = [];
     if ($request->query->has('sort')) {