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I think that when a "live" error object is stored or written, it should be possible to read it back and get a value that says an error object was stored or written. But what you read back should be a "stale" error object, so you can tell the differencebetween a "live" error and a "stored and recovered" error.
Why is this useful? Regards, Alan -- Dr Alan Watson Centro de Radioastronomía y Astrofísica Universidad Astronómico Nacional de México