After writing the log message for the bell change, I decided to
test the Book and found some issues:
1) reading it while blind discovered the book's type but wasn't
marking the book object as if it had become seen (dknown);
2) reading it while blind gave sighted feedback if it was cursed;
3) reading (blind or not) when either of the other two invocation
tools are cursed referred to those as "artifacts" even though
they aren't artifacts; the discoveries list describes them as
"unique items" but that makes for a clumsy message--use "relics"
instead.
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