OptionalincludeOptionalincludeIf true (default), include attributes that changed value from the baseline as well as new attributes. If false, only include keys that didn't exist in the baseline at all.
OptionalsnapshotForwarded to snapshotToIfcx for header / timestamp / id.
If true (default), express deletions since the baseline as tombstone opinions (
ifclite::deleted) andnullremovals. Set to false for the legacy additive-only layer shape.