Is unsubscribe() needed after takeUntil().subscribe()?

Question

Angular

Do I need to save subscription for later "unsubscribe" in ngOnDestroy (see code below)? Or will all cleanup work be done automatically after the predicate in takeUntil is executed?

public ngOnInit() {
  this.actions$
    .ofType(SIGNUP_FAILURE)
    .takeUntil(this.destroyed$)
    .do((action: Action) => {
      ...
    })
    .subscribe();
}

public ngOnDestroy() {
  this.destroyed$.next(true);
  this.destroyed$.complete();
}

Answer 1

Somewhere on SO, such a method for clearing memory was recommended, as far as I understood - it was not necessary to do unsubscribe() there.