Use ReturnTypeWillChange for PHP 7.4 compat

Author: rmccue

src/wp-includes/rest-api/class-wp-rest-resolvable-route.php

@@ -74,7 +74,8 @@ public function __invoke() {
 	 * @param string $key The key to check.
 	 * @return bool True if the key exists, false otherwise.
 	 */
-    public function offsetExists( mixed $k ) : bool {
+	#[ReturnTypeWillChange]
+    public function offsetExists( mixed $k ) {
         $this->__invoke();
         return isset( $this->resolved[ $k ] );
     }
@@ -87,7 +88,8 @@ public function offsetExists( mixed $k ) : bool {
 	 * @param string $key The key to retrieve.
 	 * @return mixed The value of the key, or null if not set. Returns by reference, so it can be modified if needed.
 	 */
-    public function &offsetGet( mixed $k ) : mixed {
+	#[ReturnTypeWillChange]
+    public function &offsetGet( mixed $k ) {
         $this->__invoke();
         return $this->resolved[ $k ];
     }
@@ -100,7 +102,8 @@ public function &offsetGet( mixed $k ) : mixed {
 	 * @param string $key The key to set.
 	 * @param mixed $value The value to set.
 	 */
-    public function offsetSet( mixed $k, mixed $v ) : void {
+	#[ReturnTypeWillChange]
+    public function offsetSet( mixed $k, mixed $v ) {
         $this->__invoke();
         $this->resolved[ $k ] = $v;
     }
@@ -112,7 +115,8 @@ public function offsetSet( mixed $k, mixed $v ) : void {
 	 *
 	 * @param string $key The key to unset.
 	 */
-    public function offsetUnset( mixed $k ) : void {
+	#[ReturnTypeWillChange]
+    public function offsetUnset( mixed $k ) {
         $this->__invoke();
         unset( $this->resolved[ $k ] );
     }

src/wp-includes/rest-api/class-wp-rest-server.php

@@ -957,8 +957,9 @@ public function get_unresolved_routes( $route_namespace = '' ) {
 		 *
 		 * @param array $endpoints The available endpoints. An array of matching regex patterns, each mapped
 		 *                         to an array of callbacks for the endpoint. These take the format
-		 *                         `'/path/regex' => array( $callback, $bitmask )` or
-		 *                         `'/path/regex' => array( array( $callback, $bitmask ).
+		 *                         `'/path/regex' => array( $callback, $bitmask )`,
+		 *                         `'/path/regex' => array( array( $callback, $bitmask ), or
+		 *                         `'/path/regex' => object(WP_REST_Resolvable_Route)
 		 */
 		$endpoints = apply_filters( 'rest_endpoints', $endpoints );