I’ve messed with it the way you are describing. The problem with doing it this way is that now the in-document citations are no longer displayed in numerical order, they are displayed based on year, so in my previous example
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Johnson 2007
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Roberts 2008
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Gomez 2010
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Marcel, 2007
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Black, 2009
If I were to cite number 1, 3 and 5 in-text they would be cited as “Content (5,1,3)”