Possible bug (or at least a difference of opinion?) with Smarten Punctuation:
If there are em dashes in the source, Smarten Punctuation adds a space before and after the em dash. This is considered incorrect in books.
Quote:
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Most newspapers insert a space before and after the dash, and many popular magazines do the same, but most books and journals omit spacing, closing whatever comes before and after the em dash right up next to it. This website prefers the latter, its style requiring the closely held em dash in running text.
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Merriam Webster: A Guide to Em Dashes, En Dashes, and Hyphens
I have a book with a lot of em dashes, and adding spaces makes for strange text layout.