This release of dyn4j is a small maintenance release to add unique contact ids to the engine. This allows you identify a contact throughout the ContactListener events (begin, persist, end, etc). You can test if a contact is the same as another by using the ContactId.equals method.
This release should not contain any breaking changes unless you were manually creating ContactPoints or subclasses thereof. See the Release Notes for more details.
No new release of the Sandbox was published for this release.