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+* Reap connections that were checked out by now-dead threads, instead
+ of waiting until they disconnect by themselves. Before this change,
+ a suitably constructed series of short-lived threads could starve
+ the connection pool, without ever having more than a couple alive at
+ the same time.
+
+ *Matthew Draper*
+
* `where.not` adds `references` for `includes` like normal `where` calls do.
Fixes #14406.