fn report_unconfirmed(st: &StreamState<'_>, report: &Reporter<'_>)Expand description
Report whatever a teardown drain could not vouch for, once.
The pairing ImpairmentKind::QueuedBytesAtTeardown was always meant to
have: a queue that was flushed best-effort into a transport that is
going away has delivered nothing it can prove, and reporting only what
stayed queued reports zero for exactly the case that loses data. See
PendingQueue::unconfirmed_bytes.
Zero, and therefore silent, on every stream that had nothing queued — which is every stream in a session with no timing action.