4.x
4.x: Convert from JUnit 4 to JUnit 6 (#8202)
4.x: Streamable + range, fromArray, take, error, defer (#8206)
4.x: Fix consumer retention in cache() upon subscribe-cancel race (#8283)
4.x: Streamable + timer + interval; cleanups (#8213)
4.x: Streamable + doOnError, forEach(StreamerInput) (#8218)