In the process, I am finding more interesting serialization glitches than I really wanted to see. I'm in the process of exterminating them while hoping that they're asymptomatic.
The problem is that when you modify this many files, you are virtually guaranteed to make a mistake somewhere. The good news is that the automated testing should catch the mistake for me.
The bad news is that this is stultifyingly dull cut and paste work. That might explain why no one else has actually done it...