ADDED and MODIFIED actions appear to do the same thing

Referencing Eureka version 2.0.4. See: https://github.com/Netflix/eureka/blob/f4c8ed1d3f1f24d6a3aac653af489e1c2984a659/eureka-client/src/main/java/com/netflix/discovery/DiscoveryClient.java#L1198-L1212

Is this on purpose? Should the MODIFIED branch actually modify the contents of the given instance, rather than re-adding it as another (identical) one?