def round.keep
import emerging-ezjson@1.3.0.0/src/fixed.bend as Fixedimport Base
246# the kept digits split at the last place
247def round.keep(+left: String, pair: String & String) -> String:
248 (kept, dropped) = pair
249 +all = String.reverse.go(kept, left)
250 bump(round.up(dropped, all), all)