ISO-8601 timestamp the PR was merged or closed; whichever applies.
OptionaltruncatedSet to true when any of the three comment streams hit the pagination cap (#1456). These endpoints return oldest-first, so a truncated bundle is missing the NEWEST reviewer voices — corpus consumers should treat the bundle as partial. Omitted when every stream fetched completely.
The full comment bundle returned for a single PR. Field order matches the typical narrative arc of a PR review (top-level reviews → inline comments → general thread chatter), so the host's extraction prompt can walk the bundle linearly.