Version 0.11 changes the aggregate function API. ### Changed - User-defined aggregate functions are now encapsulated with a new interface, `AggregateFunction`. The previous 4-callback approach has been removed and replaced with a single `MakeAggregate` callback. Not only was the previous API unwieldy, but it failed to handle concurrent aggregate function calls in a single query. - Minimum `modernc.org/sqlite` version updated to 1.20.0.