4.x
4.x: Streamable + takeUntil + groupBy + refactor + helpers (#8215)
Package shift from .rxjava3 to .rxjava4
4.x: Streamable: +delay +timeout +zip +onErrorResumeNext, cleanup (#8216)
4.x: Java Migration; records, newer API, newer syntax (#8187)
4.x: Convert from JUnit 4 to JUnit 6 (#8202)
RS -> Flow TCK conversions 1
4.x: Unit test lambdaification 23 of 23 (#8165)