BTW, "Unknown" as an author name (or it's set-language equivalent) is handled specially for various options, such as Merge and Copy to Library. If the database holds "Unknown" (or language equivalent), I treated it as an empty field in a Merge, etc. so that a book having an author name of Unknown in the first selected record is overwritten by the author name of the second selected book if it's other than "Unknown." If Automerge is set, the same thing happens with Copy To Library.
Using "Unknown Author" instead of "Unknown" will be treated as a real author name, not a null for those operations. If you simply don't know the author, I'd use "Unknown," but if no one knows the name, "Unknown Author" might be a better choice so you aren't tempted to go looking for what can't be found.
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