lua.wetgenes.gamecake.zone.scene.forget_uid
local it = scene:forget_uid( {uid=uid} )
Remove the item from the map of uids. Returns the item or nil if uid was invalid unset or our map was not pointing to the correct item.
local it = scene:forget_uid( scene.find_uid( uid ) )
Chain with find_uid to forget an item by uid and this is safe even if the item does not exist.