[zeromq-dev] subscribe/unsubscribe refcounting behaviour

[Martin Sustrik]

Jon,

> 2) are they happy with it?

It's needed to be able to aggregate subscriptions from mutliple sources. 
Currently, the subscriptions are not forwarded upstream so both 
refcounting and idempotency would work. Once the subscription forwarding 
is implemented, subscription idempotency would allow one subscriber to 
unsubscribe another one.

Martin