Something I forgot to mention: the standard rating column and user-defined rating columns can be searched using relational operators. For example, rating:>=3 finds all books with a rating of 3 or larger. Saying rating:3 is the same as saying rating:=3. Don't use quotes with these searches.
Sometime in the near future, user-defined columns of type int and float will also be searchable using relational operators.
Finally, as it is easy to forget the search label for custom columns, the tooltip for a column (on the column heading) will give it to you.
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