I think if a mine needs a low-level miner and there is only a high-level miner available, that high-level miner should simply fulfil the request. Workers have a function can_act_as, which can be used for that.
I think if a mine needs a low-level miner and there is only a high-level miner available, that high-level miner should simply fulfil the request. Workers have a function can_act_as, which can be used for that.