Closing a subscription can cause the associated fd to be re-used while
the subscription goroutine is also still trying to use it. Which can
have disastrous consequences.
So as a work around we don't close subscriptions. This means we leak
an fd, some buffer space, and goroutine. The latter will eventually
block in a channel send of a subscription event, since nothing is left
reading ont the other end. So at least it won't be consuming cycles.
Matthias Radestock
495a35a6a6