could probably pull it out and adapt it to work on...

# rx

[damian]

could probably pull it out and adapt it to work on v1
https://github.com/akarnokd/RxJava2Extensions/blob/0020c2ba6bd73ead8eb185bb6245f6469cf3100a/src/main/java/hu/akarnokd/rxjava2/operators/FlowableBufferPredicate.java