It must've just been a fluke that the same nulls didn't freak out whatever version of Qt we were using back in 0.9.9.
I've got to parse the opf a bit after KindleUnpack gets done anyway, so I may just massage those weird characters away in the plugin. I might see about doing something about it in KindleUnpack eventually, but I've got a pretty quick and easy proof-of-concept fix working right now in the plugin. Unless someone specifically opts to keep the original mobi/amazon metadata, all of the metadata where the bad characters typically occur are stripped out of the resulting epub anyway (opf comments don't survive).
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