These could only arrive in error, and might be an attempt to trigger #6690 (moved). Nobody legit can generate them now; we shouldn't start accepting them without more design, I think.
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Apologies for not responding promptly to my previous bug submission (bug 6690), but after upgrading to .20 I no longer have this and tor has been running (almost) non-stop for over a week, so I presume whatever it was, it was cleared with the new version.
Hope that helps, but I'll follow this bug closely from now on if you need more info.