WP_REST_Users_Controller::update_item( WP_REST_Request $request ): WP_REST_Response|WP_Error

763	public function update_item( $request ) {764		$user = $this->get_user( $request['id'] );765		if ( is_wp_error( $user ) ) {766			return $user;767		}768 769		$id = $user->ID;770 771		$owner_id = false;772		if ( is_string( $request['email'] ) ) {773			$owner_id = email_exists( $request['email'] );774		}775 776		if ( $owner_id && $owner_id !== $id ) {777			return new WP_Error(778				'rest_user_invalid_email',779				__( 'Invalid email address.' ),780				array( 'status' => 400 )781			);782		}783 784		if ( ! empty( $request['username'] ) && $request['username'] !== $user->user_login ) {785			return new WP_Error(786				'rest_user_invalid_argument',787				__( 'Username is not editable.' ),788				array( 'status' => 400 )789			);790		}791 792		if ( ! empty( $request['slug'] ) && $request['slug'] !== $user->user_nicename && get_user_by( 'slug', $request['slug'] ) ) {793			return new WP_Error(794				'rest_user_invalid_slug',795				__( 'Invalid slug.' ),796				array( 'status' => 400 )797			);798		}799 800		if ( ! empty( $request['roles'] ) ) {801			$check_permission = $this->check_role_update( $id, $request['roles'] );802 803			if ( is_wp_error( $check_permission ) ) {804				return $check_permission;805			}806		}807 808		$user = $this->prepare_item_for_database( $request );809 810		// Ensure we're operating on the same user we already checked.811		$user->ID = $id;812 813		$user_id = wp_update_user( wp_slash( (array) $user ) );814 815		if ( is_wp_error( $user_id ) ) {816			return $user_id;817		}818 819		$user = get_user_by( 'id', $user_id );820 821		/** This action is documented in wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php */822		do_action( 'rest_insert_user', $user, $request, false );823 824		if ( ! empty( $request['roles'] ) ) {825			array_map( array( $user, 'add_role' ), $request['roles'] );826		}827 828		$schema = $this->get_item_schema();829 830		if ( ! empty( $schema['properties']['meta'] ) && isset( $request['meta'] ) ) {831			$meta_update = $this->meta->update_value( $request['meta'], $id );832 833			if ( is_wp_error( $meta_update ) ) {834				return $meta_update;835			}836		}837 838		$user          = get_user_by( 'id', $user_id );839		$fields_update = $this->update_additional_fields_for_object( $user, $request );840 841		if ( is_wp_error( $fields_update ) ) {842			return $fields_update;