I’m trying to adopt the EventStore to store audit history data in our application. But there is a definetly lack of documentation about projections api. As I see from https://github.com/EventStore/EventStore/blob/ed7e01c034dd41d0b556c78941ab8da93ac7a038/src/EventStore.Projections.Core/Prelude/1Prelude.js there are many interesting functions like partitionBy inside projections that are not covered by http://docs.geteventstore.com/ or posts mentioned there. Is docs about that functions existing?
They are missing as they are still in beta 