My intuition tells me that addServiceProvider should add the service provider classes I specify to the archive. To my surprise, it does not. I can't see any scenario in which you specify a service provider for a class that isn't in the archive. For the edge case, you could always extract it manually after the call to addServiceProvider.

Currently:
addClass(MyServiceImpl.class).addServiceProvider(Service.class, MyServiceImpl.class)

Proposed:
addServiceProvider(Service.class, MyServiceImpl.class)