public static function set_boolean_settings( $request ) {
    foreach ( array(
      'akismet_strictness',
      'akismet_show_user_comments_approved',
    ) as $setting_key ) {

      $setting_value = $request->get_param( $setting_key );
      if ( is_null( $setting_value ) ) {
        // This setting was not specified.
        continue;
      }

      // From 4.7+, WP core will ensure that these are always boolean
      // values because they are registered with 'type' => 'boolean',
      // but we need to do this ourselves for prior versions.
      $setting_value = Akismet_REST_API::parse_boolean( $setting_value );

      update_option( $setting_key, $setting_value ? '1' : '0' );
    }

    return self::get_settings();
  }