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[TS] Recognize strict optional Array constructor signatures - #626

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Strict TypeScript signatures expose optional Array constructor parameters differently from non-strict sources. Recognize those native signatures without widening user constructor matching. Add a strict fixture covering array and collection operations.

Relevant regression coverage: 2 strict-source regressions.

Combined-stack validation at c46aa3f8b: 65 TS regressions and 22 Calls tests passed; TS and Calls Detekt main/test passed. These checks ran under the exclusive local build lock. This PR head has its own CI; the combined-stack check is not a standalone-head CI claim.

Stack: targets caelmbleidd/ts-collection-iterators-callbacks; the diff contains only this layer. Merge/rebase prerequisites first, then move this own range onto current main. Frozen experiment artifacts and runtime files are unchanged.

@CaelmBleidd
CaelmBleidd force-pushed the caelmbleidd/ts-collection-iterators-callbacks branch from dfaade5 to c0f8dad Compare October 20, 2026 09:42
@CaelmBleidd
CaelmBleidd force-pushed the caelmbleidd/ts-strict-array-signatures branch from 9b3595d to d21be8b Compare October 20, 2026 09:42
@CaelmBleidd
CaelmBleidd force-pushed the caelmbleidd/ts-collection-iterators-callbacks branch from c0f8dad to 49f210f Compare October 20, 2026 09:52
@CaelmBleidd
CaelmBleidd force-pushed the caelmbleidd/ts-strict-array-signatures branch from d21be8b to 06753e8 Compare October 20, 2026 09:52
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