diff -r 34716fd837a4 -r be944660c56a wp/wp-includes/rest-api/search/class-wp-rest-search-handler.php
--- a/wp/wp-includes/rest-api/search/class-wp-rest-search-handler.php	Tue Dec 15 15:52:01 2020 +0100
+++ b/wp/wp-includes/rest-api/search/class-wp-rest-search-handler.php	Wed Sep 21 18:19:35 2022 +0200
@@ -78,9 +78,10 @@
 	 * Prepares the search result for a given ID.
 	 *
 	 * @since 5.0.0
+	 * @since 5.6.0 The `$id` parameter can accept a string.
 	 *
-	 * @param int   $id     Item ID.
-	 * @param array $fields Fields to include for the item.
+	 * @param int|string $id     Item ID.
+	 * @param array      $fields Fields to include for the item.
 	 * @return array Associative array containing all fields for the item.
 	 */
 	abstract public function prepare_item( $id, array $fields );
@@ -89,8 +90,9 @@
 	 * Prepares links for the search result of a given ID.
 	 *
 	 * @since 5.0.0
+	 * @since 5.6.0 The `$id` parameter can accept a string.
 	 *
-	 * @param int $id Item ID.
+	 * @param int|string $id Item ID.
 	 * @return array Links for the given item.
 	 */
 	abstract public function prepare_item_links( $id );