What an attempt did to the outside system a touching target names (design §3.3, P3) — present only on the records
of a target that declared touches:
'applied' — the attempt answered (ok);
'none' — it failed, and its error itself declares effect: 'none' (the adapter's word: nothing was sent);
'unknown' — anything else: a timeout, a cancellation, a pause, or a failure the adapter did not declare
harmless. Nobody knows whether the effect happened, so the series never reports it as failed or ok: a last
attempt of unknown effect fails with UnknownEffectError — reconcile, do not retry blindly.
What an attempt did to the outside system a touching target names (design §3.3, P3) — present only on the records of a target that declared
touches:'applied'— the attempt answered (ok);'none'— it failed, and its error itself declareseffect: 'none'(the adapter's word: nothing was sent);'unknown'— anything else: a timeout, a cancellation, a pause, or a failure the adapter did not declare harmless. Nobody knows whether the effect happened, so the series never reports it as failed or ok: a last attempt of unknown effect fails withUnknownEffectError— reconcile, do not retry blindly.