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Language lookup truncates rightmost subtags · case 02

Language lookup truncates rightmost subtags.

Member previewVariant 2 · 3 implementations · 4 checks per implementation

Case contract

Bounded offline decision model: language lookup truncates rightmost subtags. Inputs are already validated protocol fields; the explicit fixtures define the supported policy, not a complete protocol implementation.

Why this case matters

This deterministic content negotiation model isolates the language-lookup-truncates-rightmost-subtags policy at a network component boundary.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
fixture 4	`"sr"`	`"sr-Latn"`	Failed

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