Combine duplicate orders into one parcel

A new Combine Duplicate Orders setting, off by default, combines the fulfilment of two orders from the same customer, to the same address, placed within a window you set, into one parcel. The orders themselves stay separate. You see the shipping Shopify would refund and nothing is refunded until you confirm it; the customer gets a short email once it goes through. Every detected pair, combined, refused or pending, is listed with the reason.