4.x
4.x: Unit test lambdaification 14 of N (#8155)
RS -> Flow TCK conversions 1
4.x: Java Migration; records, newer API, newer syntax (#8187)
4.x: Unit test lambdaification 17 of N (#8158)
4.x: Flowable API reduction: concat*, merge, concatMap*, flatMap* (#8195)
More TCK conversions
4.x: Unit test lambdaification 15 of N (#8156)
More more TCK conversions
4.x: Flowable API reduction: remaining operators & other related changes (#8200)
TCK converted
4.x: Unit test lambdaification 19 of N (#8161)
4.x: Cleanup, fix inferable types via var or diamond (#8189)
4.x: Unit test lambdaification 20 of N (#8162)