I am currently in the process of moving all guidelines for “Things 3to2 does not accept” (from the post of the same name and from stuff I have accidentally left in my head) to the bitbucket issues tracker. Some will be marked “wontfix” immediately due to the limitations inherent in 3to2, but the point is that there will be a separate issue for each individual thing that 3to2 is known not to be able to deal with properly, with its own separate little discussion thread.
I don’t know why I didn’t do this earlier.