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It looks like internally it's stored as an simple integer, 0 to 10
<meta content="8" name="calibre:rating"/>
The problem again is in average ratings. On GoodReads any book with more than 100 ratings rarely has below 3 or above 4.4. So most of that numeric range is lost, and you are left with basically 6, 7, or 8 as the only ratings that ever get used.
With the current display you basically get 6 or 8 since half stars don't show.
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