XML export of Rank field reports value as "NONE"

In the Issue Navigator, if I export the results of a search as XML, then the value of the Rank field for each issue is reported as "NONE".

I am using the XML report as a means for interfacing to Jira, and all the other information I need is there! Has the GreenHopper Ranking field type defined how to render itself in XML? I see there was a similar issue with the Excel export function and while back, now fixed.