IO540, you can also fly missed approach as IFR visually, as you would if you were VFR - this is done quite often, since it's saves fuel, especially if published missed approach procedure takes you far away from the airfield.
All in all, the most important thing is that everybody involved in the situation knows what to expect from the other side, whatever the correct definition is. Be it an ordinary traffic pattern for VFR traffic, published or specific instrument missed approach procedure for IFR traffic, etc.