I've tried different approaches for gracefully shutting down the subscription and none of them worked.

Here is what I would have expected:

1. RunWithContext to NOT return a context canceled error in case context is cancelled by client;
2. Close method to NOT return a context canceled error.

I get the error even when I Unsubscribe explicitly from all the subscriptionIDs.

The current behavior makes distinguishing legit context-cancel (meant to stop the subscriptions) from other internally triggered cancellations impossible.