anchor.diff:      /// Concatenate two addresses, takings the type of first address.
       static member (->-) (address, simulant : Simulant) = SimulantOperators.acatf address simulant
   
  -/// A tasklet to be completed at the schedule tick time.
  -type [<ReferenceEquality>] Tasklet =
  -    { ScheduledTime : int64
  -      Operation : World -> World }
  -
   /// The default dispatcher for games.
  -and GameDispatcher () =
  +type GameDispatcher () =
   
       static member FieldDefinitions =
           [define? PublishChanges true]
  
positive.code:       OptTileSetTile : TmxTilesetTile option
        TilePosition : Vector2i }
  
  /// A simulant in the world.
  type Simulant =
      interface
  
negative.code:     private
          { Subsystems : World Subsystems
            EventSystem : World EventSystem
            Tasklets : World Tasklet Queue
            OptEntityCache : KeyedCache<Entity Address * World, EntityState option>
            Components : Components
            SimulantStates : SimulantStates
  