cfb880e8a0
`sessions_for` recorded what opened from `gather`'s results, which arrive only when it runs to completion. Cancelling it discarded them, so a database that opened while a sibling was still pending was never recorded and `aclose` never closed it. `return_exceptions=True` covers a failing child, not a cancelled parent. `_open` now registers its own session, so what opened is reachable however the fan-out ends. |
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