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The app compared NAMES while Android installs by versionCode, with nothing keeping the two orderings consistent. So it could offer a build the platform then refused as a downgrade, or stay silent about one it would have accepted. The offer and the install were asking different questions. Both consumers — the shell banner and the About card — now route through one isUpdateAvailable(): decide on the ordering key whenever the server reports one, since that is the same value the package installer compares, so an offer implies an install that will actually be accepted. Name comparison survives only as the fallback for a server predating the field. isVersionNewer is deliberately untouched. It already degrades per segment and is not what was broken; rewriting it while nearby would have put the fallback path at risk for no gain. code is nullable on the wire, and that is load-bearing rather than stylistic. The app's Json sets coerceInputValues = true, which replaces a JSON null with the declared default on a NON-nullable property — so `val code: Long = 0` would have turned "this server reports no ordering key" into "its key is 0" silently, ranking every such server as infinitely behind and offering its build to everyone forever. Reading the field declaration alone would never show that; it lives in AppModule. A third caller turned up during the sweep and was deliberately left alone. NetworkStatusController compares the /healthz minClientVersion, which is a server-declared compatibility floor rather than the bundled APK — there is no ordering key on that wire at all, so names remain the only thing it can compare. Different question, correctly still using the old helper. The update channel had no tests whatsoever before this, which is worth stating: the thing deciding whether anyone is ever offered an update fails silently in both directions. The new suite pins that the key wins when it disagrees with the name, that a null key falls back rather than reading as zero, the recorded migration constraint (a new-scheme name outranks an old-scheme one across a day boundary but NOT within the same day), and the degradation cases — including that an unparseable DECIDING segment reads as zero and loses, which is why the channel must never live inside the name. Every assertion was checked against the real comparison by mirroring it, rather than from reading it: two of my first-draft comments described the wrong mechanism and were corrected on the evidence. Step 4 of 5 — Scribe task #3811, milestone #390. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SQ31KQpYbStyK5y58UmPLH