4.x
4.x: Convert from JUnit 4 to JUnit 6 (#8202)
4.x: Fix SchedulerToExecutorService invokeAll and invokeAny impl (#8205)
4.x: Streamable + timer + interval; cleanups (#8213)
4.x: Streamable + fromIterable, fromStream, hide, never, fixes (#8207)
4.x: Streamable + range, fromArray, take, error, defer (#8206)