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Successful form control collection: Multiple selections are submitted as one nested value · case 03

Multiple selections are submitted as one nested value.

Member previewVariant 3 · 3 implementations · 11 checks per implementation

Case contract

Submit enabled named controls, checked choices and only the actual submitter; emit one ordered pair per selected multiple option without value deduplication.

Why this case matters

A deterministic model of successful form control collection; this isolates one interface invariant without requiring a browser.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
multiple	`[["a", ["x", "x", "y"]]]`	`[["a", "x"], ["a", "x"], ["a", "y"]]`	Failed

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