On Mon, 09 May 2011 11:23:16 -0400, Jesse Rosenthal <jrosenthal at jhu.edu> 
> The RFC says yes on the author, no on the subject. The only things
> guaranteed are "From:" and originating timestamp. So I'm not sure why
> subject should be guaranteed a string result and not, say, "Cc." 

Apologies -- I realize now you were talking about threads and not
messages, so I can't defer to RFCs. I still agree with the others, and
about how python users would deal with it. But I see your point better
now. Sorry to clutter.

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