Multiple Subscriptions

[Janglinator]

If an entity subscribes with the same identifier, Subbus will post 2 notifications. The first subscription should be removed.

[Alarson93]

Does it post 2 notifications or is it simply 2 blocks receiving the event? We have a unit test called testDualSubscription that appears to handle this case. (Though I think we should increment the count by a number other than 1 because the current test implementation is ambiguous.)

[Janglinator]

Alex mentioned it'd be worth renaming functions to clarify the functionality. EG "AddSubscription"