allow contravariant use of Subscribers in Publisher.subscribe

[rkuhn]

Since Subscriber is inherently contravariant in its type parameter, it would be appropriate to express that at the only use-site we define:

public interface Publisher<T> {
  public void subscribe(Subscriber<? super T> sub);
}

[ldaley]

+1

[benjchristensen]

👍

[jrudolph]

👍

[rkuhn]

PR opened; @purplefox @normanmaurer @mariusaeriksen @tmontgomery please vote, perhaps we can get this into M2 which should then hopefully have the final interfaces for 1.0.

[smaldini]

+1

[smaldini]

4 votes == ok ?

[rkuhn]

still lacking one of Red Hat / Twitter / Kaazing according to the rules

[normanmaurer]

@rkuhn was not really able to follow the work much lately. But from what I read here it makes sense. So +1 I would say.

[rkuhn]

Coolio, so I guess that this can go into 0.4.0.M2 today. @smaldini can you do the honors? (i.e. press the merge button)

[tmontgomery]

👍

[smaldini]

Cheers everyone !