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44106325d5
a subtle bug surfaced when trying multiple individual requests on the same persistent session, where the connection was being removed from the watchable connections after each request, but kept in the pool; on the next request, it would set the same session callbacks; this would go on and on until connections would get exhausted, after which all of these callbacks would have to be called. fixed by having a new callbacks interface, #only, which discards existing callbacks by type, thereby ensuring there's only one of the kind.