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The semi colon is the nominal way of denoting Lastname; firstname in calibre (commas imply multiple authors). Since author sort doesn't need to specify multiple authors, calibre assumes the user actually means ; when he puts ,
The numbers are neccessary to ensure uniqueness of files, since there could be multple instances of a book in the database or multiple books with the same metadata. Also in the case of the save books feature the numbers allow calibre to recreate its database from the saved books easily via the "add books" feature.
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