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version365 is correct about EpubMerge.
As a convenience to the user, EpubMerge offers different options to fill the new book's custom columns from the merged books, include averaging numeric columns.
And EpubMerge's functionality is called from FanFicFare when creating anthology books from that plugin.
However, only the low-level functionality (the actual epub file level) of EpubMerge is used by FanFicFare. The higher level functionality (the custom column settings) of EpubMerge are ignored--because they're not relevant. When creating an anthology book in FanFicFare, there are no custom columns for the source epubs because they are not calibre books.
Reviewing the FanFicFare code, anthology metadata are indeed summed before assigning to int or float type custom columns. It's a FanFicFare issue, not an EpubMerge issue.
I'll think about it and see if anything brilliant springs to mind. Continued discussion should be moved to the FanFicFare thread.
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