What is the difference between the isStopped and closed property of the Subject class?

The class Subject has 2 properties closed and isStopped. I know that closed can be used to check whether the Subject can still be subscribed to, but what should isStopped be used for exactly?

I am asking this because I am trying to find a way to know when a next operation of a BehaviourSubject is completed. Can I use isStopped for that or is it used for something else?

The compared behavior of closed and isStopped can be seen in terms of resultant values after each operation:

• On error:
  • closed: false
  • isStopped: true.
• If Subject gets completed:
  • closed: false
  • isStopped: true.
• If unsubscribed:
  • closed: true
  • isStopped: true

This is non-exhaustive just show the commons scenarios.