Hmm, well I can see why both might be desired. But I'd guess that if you are using Book View then you don't really know or care much about the HTML underneath (at least for the time you're using Book View). In that case you might want the selection of the format to nuke all other formats. And if you want to retain those classes, you are more likely to use Code View anyway since Book View will often not apply styles in the way you want. Whether it'll change or not is another issue, but it might be something you can customize in the new version.
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