PrefixConversionUnion

How FCQRS names a saga it starts for an originator event. `PrefixConversion (Some f)` names the saga `originatorId~Saga~f(correlationId)`, and `Some id` gives the standard name `originatorId~Saga~correlationId`. A saga reads its originator and correlation id from its own name to receive the originator's events and to correlate the commands it sends, so `f` must return the correlation id, optionally after a prefix that ends with `~` (for example `"audit~" + cid`). The starter logs an error and does not start a saga when `f` changes or drops the correlation id, or throws. `PrefixConversion None` uses `originatorId~correlationId` as the saga name. That name has no `~Saga~` marker, so the saga does not receive its originator's events.