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use game_events.add in on_event.lua previously on_event.lua and game_events.add had separate priority lists, so that independent of the priority parameter (which both game_events.add and on_event.lua now support) on_event.lua events were always executed first. The set_undoable(true) call is there to match the previous behavior of on_event.lua where events implemented via on_event were undoable by default. The higher default priority of 0.5 is there to match the previous behavior of on_event.lua where events implemented via on_event.lua were always run before wml events.