PHP: Add some code comments for future reference

includes/Admin/ImgAreaSelect_Patch.php

@@ -36,6 +36,8 @@
 
 /**
  * Class ImgAreaSelect_Patch
+ *
+ * TODO Remove this workaround once WP 6.2 is min version. See https://github.com/WordPress/wordpress-develop/commit/ef0c1d1dd28f13bbe6b39447fb5fbc36edf7df80
  */
 class ImgAreaSelect_Patch implements Conditional, Service, Registerable {
 	/**

includes/REST_API/Font_Controller.php

@@ -313,6 +313,7 @@ public function prepare_item_for_response( $item, $request ): WP_REST_Response {
 		 */
 		$response = rest_ensure_response( $data );
 
+		// Make preparing links optional after WP 6.1 is min version. See https://github.com/WordPress/wordpress-develop/commit/b7bae6936a9ad54f85bad7e5a73a9d110190d927.
 		$links = $this->prepare_links( $post );
 		$response->add_links( $links );
 

includes/REST_API/Publisher_Logos_Controller.php

@@ -426,6 +426,7 @@ public function prepare_item_for_response( $post, $request ): WP_REST_Response {
 		 */
 		$response = rest_ensure_response( $data );
 
+		// Make preparing links optional after WP 6.1 is min version. See https://github.com/WordPress/wordpress-develop/commit/b7bae6936a9ad54f85bad7e5a73a9d110190d927.
 		$links = $this->prepare_links( $post );
 		$response->add_links( $links );
 

includes/REST_API/Stories_Autosaves_Controller.php

@@ -43,6 +43,8 @@
 /**
  * Stories_Autosaves_Controller class.
  *
+ * Register using register_post_type once https://core.trac.wordpress.org/ticket/56922 is committed.
+ *
  * @phpstan-import-type Schema from \Google\Web_Stories\REST_API\Stories_Base_Controller
  */
 class Stories_Autosaves_Controller extends WP_REST_Autosaves_Controller implements Service, Delayed, Registerable, HasRequirements {

includes/REST_API/Stories_Controller.php

@@ -325,6 +325,7 @@ public function prime_post_caches( $posts ): array {
 		if ( ! empty( $post_ids ) ) {
 			_prime_post_caches( $post_ids );
 		}
+		// Should not be need once WP 6.1 is min required version. https://github.com/WordPress/wordpress-develop/commit/aff6a79b27d529b92e499018433d01d695457b09.
 		$user_ids = $this->get_attached_user_ids( $posts );
 		if ( ! empty( $user_ids ) ) {
 			cache_users( $user_ids );
@@ -443,6 +444,7 @@ protected function get_attached_user_ids( array $posts ): array {
 	 * @return int[] Array of post ids.
 	 */
 	protected function get_attached_post_ids( array $posts ): array {
+		// Post thumbnail should not be needed be primed once WP 6.1 is min version. See https://github.com/WordPress/wordpress-develop/commit/c2de42b9adec84397b4c3e5895809f01880a241a.
 		$thumb_ids     = array_filter( array_map( 'get_post_thumbnail_id', $posts ) );
 		$publisher_ids = array_filter( array_map( [ $this, 'get_publisher_logo_id' ], $posts ) );
 

includes/REST_API/Stories_Lock_Controller.php

@@ -344,6 +344,7 @@ public function prepare_item_for_response( $item, $request ) {
 		 */
 		$post_id = $request['id'];
 
+		// Make preparing links optional after WP 6.1 is min version. See https://github.com/WordPress/wordpress-develop/commit/b7bae6936a9ad54f85bad7e5a73a9d110190d927.
 		$response->add_links( $this->prepare_links( $item, $post_id ) );
 
 		$post_type = $this->story_post_type->get_slug();

includes/REST_API/Stories_Media_Controller.php

@@ -352,7 +352,9 @@ protected function process_post( $post_id, $parent_post, $original_id ) {
 	 * @return int[] Array of post ids.
 	 */
 	protected function get_attached_post_ids( array $posts ): array {
-		$thumb_ids  = array_filter( array_map( 'get_post_thumbnail_id', $posts ) );
+		// Post thumbnail should not be need to be primed once WP 6.1 is min version. See https://github.com/WordPress/wordpress-develop/commit/c2de42b9adec84397b4c3e5895809f01880a241a.
+		$thumb_ids = array_filter( array_map( 'get_post_thumbnail_id', $posts ) );
+		// Post parent should not be need to be primed once WP 6.1 is min version. See https://github.com/WordPress/wordpress-develop/commit/9a488568a027b3b84fbac7b4d25cf43f86dd7a13.
 		$parent_ids = array_filter( wp_list_pluck( $posts, 'post_parent' ) );
 
 		return array_unique( [ ...$thumb_ids, ...$parent_ids ] );

includes/namespace.php

@@ -176,12 +176,6 @@ function load_functions(): void {
  * @return array<string, array{body: string, headers: array<string,string>}|array<string, array{body: string, headers: array<string,string>}>> Modified reduce accumulator.
  */
 function rest_preload_api_request( array $memo, $path ): array {
-	// array_reduce() doesn't support passing an array in PHP 5.2,
-	// so we need to make sure we start with one.
-	if ( ! \is_array( $memo ) ) {
-		$memo = [];
-	}
-
 	if ( empty( $path ) ) {
 		return $memo;
 	}
@@ -210,6 +204,7 @@ function rest_preload_api_request( array $memo, $path ): array {
 		return $memo;
 	}
 
+	// This line is different from code. Adds untrailingslashit. See https://core.trac.wordpress.org/ticket/57048.
 	$request = new WP_REST_Request( $method, untrailingslashit( $path_parts['path'] ) );
 	if ( ! empty( $path_parts['query'] ) ) {
 		$query_params = [];