From 6fff13241ab8c03712cd489962a9bbadf9159622 Mon Sep 17 00:00:00 2001
From: Kamil Tekiela <tekiela246@gmail.com>
Date: Thu, 30 Mar 2023 12:47:13 +0100
Subject: [PATCH] Optimize isList

---
 src/Assert.php | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/src/Assert.php b/src/Assert.php
index a427420..dfb96a3 100644
--- a/src/Assert.php
+++ b/src/Assert.php
@@ -1875,17 +1875,24 @@ public static function isList($array, $message = '')
             );
         }
 
-        if ($array === \array_values($array)) {
-            return;
-        }
-
-        $nextKey = -1;
-        foreach ($array as $k => $v) {
-            if ($k !== ++$nextKey) {
+        if (\function_exists('array_is_list')) {
+            if (!\array_is_list($array)) {
                 static::reportInvalidArgument(
                     $message ?: 'Expected list - non-associative array.'
                 );
             }
+            return;
+        }
+
+        if ([] === $array) {
+            return;
+        }
+
+        $keys = array_keys($array);
+        if (array_keys($keys) !== $keys) {
+            static::reportInvalidArgument(
+                $message ?: 'Expected list - non-associative array.'
+            );
         }
     }