internal Order(
Price price, OrderState state, Uid market, Uid contract, Side side)
{
Price = price;
State = state;
Market = market;
Contract = contract;
Side = side;
}
internal void Update(OrderState updated)
{
_status = updated.Status;
_quantityFilled = updated.QuantityFilled;
_cancelReason = updated.CancelReason;
}