ExperimentalOptional Readonly ExperimentalattributionAttribution strings a presentation must display when non-empty.
Readonly ExperimentalboundsReadonly ExperimentalcomputedOptional Readonly ExperimentaldegradedReasons the source degraded the aggregation, copied from Result.degraded.
Optional Readonly ExperimentalnotesFree-form producer notes (bounded scan, alias fallback, timezone, …).
Readonly ExperimentalpushdownTrue when the aggregation executed inside the source / server plan.
Why the numbers can be trusted, and what they cost. Presentation adapters surface this verbatim — they never re-derive or embellish it.