#2077 Seems to have made stub classes final. As stubs do remote calls, it's usually important for them to be mockable to write unit tests, but mockito can't mock final classes. Previously users could use the interface I guess. While I understand the reasoning of dropping the interface for service classes in #1469, to allow stub upgrades without breaking service implementation code compile, does this apply to client stubs too? It'd be nice for the stub classes to either be non-final or have interfaces to allow mocking.