…bservable

Resolves an issue where the resulting observable would complete when the closingNotifier completed. Notifier completion should not complete the result, only source completion should do that.

BREAKING CHANGE: closingNotifier no longer closes the result of `buffer`. If that is truly a desired behavior, then you should use `takeUntil`. Something like: `source$.pipe(buffer(notifier$), takeUntil(notifier$.pipe(ignoreElements(), endWith(true))))`, where `notifier$` is multicast, although there are many ways to compose this behavior.

BREAKING CHANGE: Final buffered values will now always be emitted. To get the same behavior as the previous release, you can use `endWith` and `skipLast(1)`, like so: `source$.pipe(buffer(notifier$.pipe(endWith(true))), skipLast(1))`

Fixes ReactiveX#3990, ReactiveX#6035

Resolves an issue where the windowBoundary complete would complete the resulting observable.

BREAKING CHANGE: The windowBoundaries observable no longer completes the result. It was only ever meant to notify of the window boundary. To get the same behavior as the old behavior, you would need to add an `endWith` and a `skipLast(1)` like so:  `source$.pipe(window(notifier$.pipe(endWith(true))), skipLast(1))`.