diff -r 3d4e9c994f10 -r a86126ab1dd4 wp/wp-includes/rest-api/endpoints/class-wp-rest-post-statuses-controller.php
--- a/wp/wp-includes/rest-api/endpoints/class-wp-rest-post-statuses-controller.php	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-includes/rest-api/endpoints/class-wp-rest-post-statuses-controller.php	Tue Dec 15 13:49:49 2020 +0100
@@ -78,7 +78,7 @@
 	 * @since 4.7.0
 	 *
 	 * @param WP_REST_Request $request Full details about the request.
-	 * @return WP_Error|bool True if the request has read access, WP_Error object otherwise.
+	 * @return true|WP_Error True if the request has read access, WP_Error object otherwise.
 	 */
 	public function get_items_permissions_check( $request ) {
 		if ( 'edit' === $request['context'] ) {
@@ -89,7 +89,12 @@
 					return true;
 				}
 			}
-			return new WP_Error( 'rest_cannot_view', __( 'Sorry, you are not allowed to manage post statuses.' ), array( 'status' => rest_authorization_required_code() ) );
+
+			return new WP_Error(
+				'rest_cannot_view',
+				__( 'Sorry, you are not allowed to manage post statuses.' ),
+				array( 'status' => rest_authorization_required_code() )
+			);
 		}
 
 		return true;
@@ -101,7 +106,7 @@
 	 * @since 4.7.0
 	 *
 	 * @param WP_REST_Request $request Full details about the request.
-	 * @return WP_Error|WP_REST_Response Response object on success, or WP_Error object on failure.
+	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 	 */
 	public function get_items( $request ) {
 		$data              = array();
@@ -128,19 +133,27 @@
 	 * @since 4.7.0
 	 *
 	 * @param WP_REST_Request $request Full details about the request.
-	 * @return WP_Error|bool True if the request has read access for the item, WP_Error object otherwise.
+	 * @return true|WP_Error True if the request has read access for the item, WP_Error object otherwise.
 	 */
 	public function get_item_permissions_check( $request ) {
 		$status = get_post_status_object( $request['status'] );
 
 		if ( empty( $status ) ) {
-			return new WP_Error( 'rest_status_invalid', __( 'Invalid status.' ), array( 'status' => 404 ) );
+			return new WP_Error(
+				'rest_status_invalid',
+				__( 'Invalid status.' ),
+				array( 'status' => 404 )
+			);
 		}
 
 		$check = $this->check_read_permission( $status );
 
 		if ( ! $check ) {
-			return new WP_Error( 'rest_cannot_read_status', __( 'Cannot view status.' ), array( 'status' => rest_authorization_required_code() ) );
+			return new WP_Error(
+				'rest_cannot_read_status',
+				__( 'Cannot view status.' ),
+				array( 'status' => rest_authorization_required_code() )
+			);
 		}
 
 		return true;
@@ -178,13 +191,17 @@
 	 * @since 4.7.0
 	 *
 	 * @param WP_REST_Request $request Full details about the request.
-	 * @return WP_Error|WP_REST_Response Response object on success, or WP_Error object on failure.
+	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
 	 */
 	public function get_item( $request ) {
 		$obj = get_post_status_object( $request['status'] );
 
 		if ( empty( $obj ) ) {
-			return new WP_Error( 'rest_status_invalid', __( 'Invalid status.' ), array( 'status' => 404 ) );
+			return new WP_Error(
+				'rest_status_invalid',
+				__( 'Invalid status.' ),
+				array( 'status' => 404 )
+			);
 		}
 
 		$data = $this->prepare_item_for_response( $obj, $request );
@@ -234,6 +251,10 @@
 			$data['slug'] = $status->name;
 		}
 
+		if ( in_array( 'date_floating', $fields, true ) ) {
+			$data['date_floating'] = $status->date_floating;
+		}
+
 		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
 		$data    = $this->add_additional_fields_to_object( $data, $request );
 		$data    = $this->filter_response_by_context( $data, $context );
@@ -268,57 +289,69 @@
 	 * @return array Item schema data.
 	 */
 	public function get_item_schema() {
+		if ( $this->schema ) {
+			return $this->add_additional_fields_schema( $this->schema );
+		}
+
 		$schema = array(
 			'$schema'    => 'http://json-schema.org/draft-04/schema#',
 			'title'      => 'status',
 			'type'       => 'object',
 			'properties' => array(
-				'name'         => array(
+				'name'          => array(
 					'description' => __( 'The title for the status.' ),
 					'type'        => 'string',
 					'context'     => array( 'embed', 'view', 'edit' ),
 					'readonly'    => true,
 				),
-				'private'      => array(
+				'private'       => array(
 					'description' => __( 'Whether posts with this status should be private.' ),
 					'type'        => 'boolean',
 					'context'     => array( 'edit' ),
 					'readonly'    => true,
 				),
-				'protected'    => array(
+				'protected'     => array(
 					'description' => __( 'Whether posts with this status should be protected.' ),
 					'type'        => 'boolean',
 					'context'     => array( 'edit' ),
 					'readonly'    => true,
 				),
-				'public'       => array(
+				'public'        => array(
 					'description' => __( 'Whether posts of this status should be shown in the front end of the site.' ),
 					'type'        => 'boolean',
 					'context'     => array( 'view', 'edit' ),
 					'readonly'    => true,
 				),
-				'queryable'    => array(
+				'queryable'     => array(
 					'description' => __( 'Whether posts with this status should be publicly-queryable.' ),
 					'type'        => 'boolean',
 					'context'     => array( 'view', 'edit' ),
 					'readonly'    => true,
 				),
-				'show_in_list' => array(
+				'show_in_list'  => array(
 					'description' => __( 'Whether to include posts in the edit listing for their post type.' ),
 					'type'        => 'boolean',
 					'context'     => array( 'edit' ),
 					'readonly'    => true,
 				),
-				'slug'         => array(
+				'slug'          => array(
 					'description' => __( 'An alphanumeric identifier for the status.' ),
 					'type'        => 'string',
 					'context'     => array( 'embed', 'view', 'edit' ),
 					'readonly'    => true,
 				),
+				'date_floating' => array(
+					'description' => __( 'Whether posts of this status may have floating published dates.' ),
+					'type'        => 'boolean',
+					'context'     => array( 'view', 'edit' ),
+					'readonly'    => true,
+				),
 			),
 		);
 
-		return $this->add_additional_fields_schema( $schema );
+		$this->schema = $schema;
+
+		return $this->add_additional_fields_schema( $this->schema );
 	}
 
 	/**