[Intl] Leverage array_is_list

Author: fancyweb

Data/Bundle/Writer/TextBundleWriter.php

@@ -78,10 +78,8 @@ private function writeResource($file, mixed $value, int $indentation, bool $requ
         if (\is_array($value)) {
             $intValues = \count($value) === \count(array_filter($value, 'is_int'));
 
-            $keys = array_keys($value);
-
             // check that the keys are 0-indexed and ascending
-            $intKeys = $keys === range(0, \count($keys) - 1);
+            $intKeys = array_is_list($value);
 
             if ($intValues && $intKeys) {
                 $this->writeIntVector($file, $value, $indentation);

composer.json

@@ -24,7 +24,8 @@
         }
     ],
     "require": {
-        "php": ">=8.0.2"
+        "php": ">=8.0.2",
+        "symfony/polyfill-php81": "^1.22"
     },
     "require-dev": {
         "symfony/filesystem": "^5.4|^6.0"