Comment 144 for bug 113201

(From update of attachment 311500)
I'll test this as best I can, and cross-my-heart-hope-to-be-flamed-by-Brad promise to write Tunit fodder once we get clear of the B5 cruch, but I think the bestest of testests is going to be PAC in the wild -- both to determine to what extent it repairs the problem, and to find cases where it might interfere (though I think those unlikely, based on my growing understanding of this code).