Column.History: type of bendvy-ecs-core@0.1.0.3
Import: import bendvy-ecs-core@0.1.0.3/column.bend as Column
Lines 7-11 of bendvy-ecs-core@0.1.0.3/column.bend: https://jend.leeeet.dev/read.txt?path=bendvy-ecs-core@0.1.0.3/column.bend&start_line=7&end_line=11

import Base

# Schema provisioning owns columns. Gameplay receives abstract providers instead.
# IDs are one-based; this bounded slice supports at most 131072 slots.
type History<-S:Data,-C:Type> is Type:
  HistoryNil{}
  HistoryCon{id:U32,value:Maybe<&1,C>,rest:History<S,C>}

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32