t_old_index = game.world.things.index(t_old)
game.world.things[t_old_index] = t_new
cmd_THING_TYPE.argtypes = 'int:nonneg string:thingtype'
t_old_index = game.world.things.index(t_old)
game.world.things[t_old_index] = t_new
cmd_THING_TYPE.argtypes = 'int:nonneg string:thingtype'