thanks for the discussion and the suggestions, all!

in short, the conclusions are on the right track. transactions, gets,
and puts are SERIALIZABLE. queries, on the other hand, are more or
less READ_COMMITTED, since index updates are not transactional. that's
why we don't support queries inside transactions. (index updates are
definitely synchronous within their corresponding put() or
run_in_transaction() call, though!)

i've added a note to my todo list to review the article and consider
the updates suggested here. thanks again!
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