One author where I use decimals is Janet Evanovich. Her Stephanie Plum books are all numbered in the title. So they get integer series numbers.
There are also in between books, like "Visions of Sugar Plums" which is a holiday novel, publsihed between the main series books 8 and 9. So I give it the number 8.5.
I also use them to insert a book in a series or series like column, then I can sort by the numbers and then bulk edit to renumber them.
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