In this release, MicroProfile Reactive Streams Operators will align with Jakarta EE 8.
OSGi dependencies marked as "provided"
ReactiveStreamsFactory.fromSubscriber parameter type change
Update to Jakarta EE8 APIs for MP 4.0
TCK clarification: (#141)
There is no API breaking changes. Major release is based on the fact that some dependencies have changed their scope from compile to provided, which might break some end users.