stamp
abstract suspend fun stamp(ref: AggregateRef, access: Map<String, Any?>, asOf: Int, from: Int, until: Int): Int
Writes access, the attributes of ref as of its version asOf, over its streams of the versions from from until until (exclusive) that are not stamped or are stamped as of asOf or earlier; returns how many it wrote. A version the store does not hold is passed over.