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Breadcrumb ancestor rendering: The current breadcrumb is exposed as a navigation link · case 04

The current breadcrumb is exposed as a navigation link.

Member previewVariant 4 · 3 implementations · 10 checks per implementation

Case contract

Append current after ancestors; optionally hide a distinct root; collapse long paths preserving root and recent tail within budget; only ancestors are links. Budget is at least two.

Why this case matters

A deterministic model of breadcrumb ancestor rendering; 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
normal	`[["root", true], ["parent", true], ["current", true]]`	`[["root", true], ["parent", true], ["current", false]]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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