But it is still an epub. A book might not be well-written, but it's still a book. The epub may not have valid xhtml in it, or pass epubcheck, but its still an epub.
It seems likely that Sigil will be modified to save/open any .epub without the ability to have it automatically cleaned (though it would still be re-arranged into 'standard' folders), and require you to check/clean it as you do with Validate.
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