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Some last-minute contributions; a typo and making the table of contents look consistent.
Changed the language around this late change, which looked confusing to me. Perhaps it is because the subject of "its purpose" can be interpreted in a couple of different ways (purpose of 1. write or purpose of 2. having a zero input). Wipe-on-read is exactly what we want (it's a "good" side effect -- well, that would be a bit confusing language too, as it is not a side effect anymore if it is mandatory.) b2babe3#r55796205
Anyway, the layout looks better now as the section doesn't leak one line into the next page :)
Cheers,