(run { this@comment.parent?.apply { this.value === true } } == true) ?: if ((this@comment.value as? Boolean) != true) false else true

What is your goal? Custom stuff isn’t too hard if you just want to implement basic password login and token-based auth. Otherwise you could use something like Firebase, Okta, or Cognito.

What if the suggestions have warnings like “experimental” or “unstable”?