TODO: think about supporting Cursor's underestimatedCount
TODO: think about supporting Cursor's underestimatedCount

groue/GRDB.swift,zmeyc/GRDB.swift,zmeyc/GRDB.swift,groue/GRDB.swift,zmeyc/GRDB.swift,groue/GRDB.swift,groue/GRDB.swift,zmeyc/GRDB.swift