4.x
4.x: Convert from JUnit 4 to JUnit 6 (#8202)
Package shift from .rxjava3 to .rxjava4
4.x: Streamable + doOnError, forEach(StreamerInput) (#8218)
4.x: Unit test lambdaification 23 of 23 (#8165)
4.x: Cleanup; build, safevarargs, small typos (#8183)
4.x: Java Migration; records, newer API, newer syntax (#8187)
4.x: Unit test lambdaification 17 of N (#8158)