Description
#2948 More assertions for TestSubscriber
#2956 OperatorObserveOn should not request more after child is unsubscribed
#2951 OperatorConcat - prevent request overflow and fix race condition
#2950 OperatorGroupBy - check for request overflow and don't decrement when at Long.MAX_VALUE
#2923 OnBackpressureLatest: Non-blocking version of the toBlocking().latest() operator.
#2907 Fixed schedule race and task retention with ExecutorScheduler.
#2929 OperatorObserveOn onComplete can be emitted despite onError being called
#2940 Remove unnecessary localHasValue check
#2939 publish: Fix another race between terminalEvent and the queue being empty.
#2938 Fixed Observable.combineLatest overflow bug on Android
#2936 Fix TestSubject bug
#2934 Fix termination race condition in OperatorPublish.dispatch
#2963 Set of standard producers and updated queue implementations with some