Index: trunk/src/wp-includes/functions.php
===================================================================
--- trunk/src/wp-includes/functions.php	(revision 62521)
+++ trunk/src/wp-includes/functions.php	(revision 62524)
@@ -5291,18 +5291,39 @@
  * Determines if the variable is a numeric-indexed array.
  *
+ * Note! This answers a different question than {@see array_is_list()} and is
+ *       more flexible to handle situations where some numeric array indices
+ *       have been removed. A numeric-indexed array is only a “list” when the
+ *       array keys form a contiguous range from zero to the highest key.
+ *
+ * Example:
+ *
+ *     true  === wp_is_numeric_array( array( 1, 2, 3, 4 ) );
+ *     false === wp_is_numeric_array( array( 'name' => 'WordPress' ) );
+ *
+ *     // All-numeric keys vs. list.
+ *     $above_two   = array_filter( array( 1, 2, 8, 9 ), fn ( $v ) => $v > 2 );
+ *     $above_two === array( '2' => 8, '3' => 9 );
+ *     true       === wp_is_numeric_array( $above_two );
+ *     false      === array_is_list( $above_two );
+ *
  * @since 4.4.0
  *
  * @param mixed $data Variable to check.
  * @return bool Whether the variable is a list.
- */
-function wp_is_numeric_array( $data ) {
+ *
+ * @phpstan-assert-if-true array<int, mixed> $data
+ */
+function wp_is_numeric_array( $data ): bool {
 	if ( ! is_array( $data ) ) {
 		return false;
 	}
 
-	$keys        = array_keys( $data );
-	$string_keys = array_filter( $keys, 'is_string' );
-
-	return count( $string_keys ) === 0;
+	foreach ( $data as $key => $value ) {
+		if ( is_string( $key ) ) {
+			return false;
+		}
+	}
+
+	return true;
 }