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Almost all values in Calibre are tables in a Relational Database.
The first use of a value makes the entry in the <value type> table and gets assigned an 'Index number'.
The that index is linked to the Title (index).
All additional uses (other books)just use the index as a link.
The indexes are sequentially assigned and never change.
Bottom line is, the book metadata entry will be biased by previously use of the value when imported.
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