Readonly_Readonly~effect/The defect itself: what was thrown, or given to Effect.die.
Optional ReadonlykeyThe subscription's key, for a defect in a subscription. It may hold data, as a key may.
Optional ReadonlyonThe message update was given, for a defect in update, by its tags as the logs describe it by default
(Home › Products › Deleted): never its data.
OptionalstackReadonlywhere
The defect a run dies with: the one that happened, as its
cause, and where it happened, which only the run knows, with the message it happened on for one inupdate. The run logs nothing about it: reporting it is the job of whoever runs the program.