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Sigil adds virtually nothing that isn't required to make it valid. If you use the TOC editor, it may add a line or two to indicate that a particular heading isn't in the TOC, but that is about it. Sigil Flight Crew points out errors with line numbers also, though it may show the end of the problem instead of the beginning. With Sigil the whole book is unzipped when opened and rezipped only when saved. You can look at the result with book view even without saving, generally.
Calibre is another story entirely, adding all sorts of classes, etc.
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