Optionalinflightan awaited fetch() still in flight
Optionaloutboundan outbound TCP socket from connect(), or an outbound WebSocket
Optionalpendingan armed alarm; present here and not disqualifying
Optionalpendinga setTimeout or setInterval callback that has not fired
Optionalrequesta request or event whose handler has not returned
Optionalstandardthe standard WebSocket API, as opposed to the hibernatable one
what a caller left open at the moment the object went idle