Whether child is ready AND fresh for view-version version. Freshness is
tracked only for the stamped leaf types; a ready non-leaf child (nested
group / partition wrapper) has no per-slice staleness and is always fresh —
so the slice-aware fallback is a no-op for those. A ready leaf whose stamp is
absent/older than version is stale (its geometry reflects a previous slice).
Whether
childis ready AND fresh for view-versionversion. Freshness is tracked only for the stamped leaf types; a ready non-leaf child (nested group / partition wrapper) has no per-slice staleness and is always fresh — so the slice-aware fallback is a no-op for those. A ready leaf whose stamp is absent/older thanversionis stale (its geometry reflects a previous slice).