That was part of my uid pull request. https://github.com/akka/akka/pull/1244
I changed such occurrences in akka code. For user code I have described the problem in the migration guide.
It is not possible to fix. Equals and hashCode cannot be based on wildcard matching, it would violate the contract of equals.
This specific issue was discussed here: https://groups.google.com/d/msg/akka-dev/bXpaIEQ_CdE/XI1YZFnP5jQJ