code: function registerOptionsObserver(instance) {
      if (!instance._mounted || !instance._options) {
        return
      }
  
      instance._observer.observe(instance._options, {
        childList: true,
        attributes: true,
        characterData: true,
        subtree: true,
        attributeFilter: ['disabled', 'label', 'selected', 'title', 'multiple'],
      })
    }
docs: Registers the provided szn-options element's DOM mutation observer to observe the related options for changes.
  
  @param {SznElements.SznOptions} instance The szn-options element instance.