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Every widened-shape test in the branch used a one-file corpus, so not one of the 149 first-child reselections was pinned — the tier that commits to `children[0]` unfiltered had no test that could see which file it commits to. Kotlin and Java now pin that choice absolutely, in both insertion orders, for the member path (tier 3, both members) and the wildcard path (tier 1, one file) separately, saying plainly that both candidates are valid members and the only tie-break is file-set iteration order. The tier-3-preempts-tier-4 class gets its first gate, with a control that makes it a transition rather than a fact. The bench corpus holds zero instances, so this case is the only thing standing between that behaviour and a silent revert. C# gains three absolute arms, because its differential harness cannot see any of them — the legacy copy was edited in lockstep with production, which the file's own header admits. One pins the empty-`dirPrefix` filter the branch calls load-bearing and which nothing defended: deleting the guard leaves the whole suite green but changes the answer, so the arm was verified to fail with the guard removed and pass with it restored. Java gains the negative control Kotlin already had. `kotlin-index-internals.test.ts` stops implying coverage it does not have. The mutation matrix is recorded in its header: deleting the memo passes every arm (it is output-identical by construction), deleting the compaction's `slice()` passes every arm (a JS array's capacity has no reflective surface), while mis-keying the memo fails three and compacting-but-never-storing fails two. Four arms were added that do fail under those mutations. V8's growth steps were re-measured — 1, 19, 46, 86 with growth at lengths 2, 20, 47, 87 — so the old 1/17/41 model, which under-counted the slack at 40 files by 6x, is gone. `go-package-resolve.test.ts` drops four `as never` casts that were hiding nothing (`GoModuleConfig` is structurally satisfied), and pins vendor/, testdata/ and nested-go.mod directories, which merge into the importing package — a pre-existing unmodelled gap, verified present before #2881 and documented as such rather than blamed on it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Kim7UK3kPhF1ZRZDuuvnus |
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