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Browser-style history transitions: Replace adds a history entry instead of updating current · case 04

Replace adds a history entry instead of updating current.

Member previewVariant 4 · 3 implementations · 12 checks per implementation

Case contract

Push truncates forward history and selects the new entry; replace retains stack length; back and forward clamp to existing entries; reload leaves history intact.

Why this case matters

A deterministic model of browser-style history transitions; 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
replace	`[["a", "b", "c", "x"], 1]`	`[["a", "x", "c"], 1]`	Failed

MEMBER ARCHIVE

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

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