Clojurians Log v2

Hi, I am studying a bit how AsOfDB and SinceDB are implemented in https://github.com/replikativ/datahike/blob/78fbfb2395869c07810e586a289afea7c5bc89a6/src/datahike/db.cljc . Both of them call dbs/temporal-search to get the history including both additions and retraction over time. In the case of AsOfDB, it calls the function filter-as-of-datoms which in turn calls get-current-values to combine the additions and retractions for every entity and attribute. In the case of SinceDB, it calls filter-since, but that functions simply throws away the retractions using the line https://github.com/replikativ/datahike/blob/78fbfb2395869c07810e586a289afea7c5bc89a6/src/datahike/db.cljc#L477 instead. Does anyone know why we would not use the get-current-values function also from the filter-since function just like we did for the filter-as-of-datoms?