I'm also having trouble finding out what all that special english actually means.
So far experimenting shows:
Comma separated text with 'Contains names' checked - separates entries with &.
For example, book is in several sources (amazon, PG, MR), and you enter 'amazon, PG, MR' in your custom column, it becomes separate option in dropdown list. If you want dropdown options before every entry, you must use 'amazon & PG & MR'.
In Book Details Panel it shows as 'amazon & PG & MR'.
Comma separated text with 'Contains names' unchecked - separates entries with ,.
You can enter 'amazon, PG, MR', and each entry becomes separate option in dropdown list.
In Book Details Panel it shows as 'amazon, PG, MR'.
If story is in several omnibuses, it seems better to use &-d version. I'm still meditating about 'Source', at first I didn't like &s, but maybe I'm changing my mind.
Of others, I have little information. What does 'show checkmarks' do? Where to use floating point numbers or integers? There already is series field, what else series-like could I find? Or already mentioned text with fixed values. Etc.
Hopefully other people will pitch in with their uses for custom columns, it's much easier to find 'Hey, that's a good idea' than 'I would like something...' (or horror unspeakable - 'I should have used different option!').
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