I have a text-based custom column in Calibre I use to write down the volumes included, e.g. [1-3]. In the default series column I just put 1, because it doesn't support multiple volumes, and I hate using fractions. The next volume would then be 4. On my Kobo I only see the default series data, of course, but this doesn't bother me - I look things up in Calibre if needed.
I know most folks use fractions in this case, but I don't want to.
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