SequentialIds

The ids the test DSL gives domain code, the same on every run: the n-th global id is id-n, the n-th id of an aggregate type is <aggregate>-n (order-1, order-2), each counted from 1.

An aggregateSpec counts across the whole specification (a fork copies the counts, so it goes on from where the specification was); a sagaSpec counts anew for each handling, as each handling of a commit gets a context of its own, so handling it again takes the same ids.