Hello, What is `version` in `json_tradeoffer` from form of tradeoffer? `node-steam-tradeoffer-manager` have set on 4 (https://github.com/DoctorMcKay/node-steam-tradeoffer-manager/blob/master/lib/classes/TradeOffer.js#L297). I checked it while sending offers on steam. If I sent item for friend, `version` is equeal 2, but If I sent offer "item for item" and "nothing for their item", `version` is equeal 3.