4.x
Package shift from .rxjava3 to .rxjava4
4.x: Streamable - optimize several operator internals (#8238)
4.x: Streamable, improved range and collect internals + JMH (#8235)
-> import static java.util.concurrent.Flow.*; 1
4.x: Cleanup: Serial annotation, getFirst usage (#8180)
4.x: Unit test lambdaification 23 of 23 (#8165)