FA-75675 / Text diff and three-way merge / Member archive

Three-way key-value merge: keys added only by their branch are dropped · case 05

New settings introduced on the other branch are missing after the merge.

Member previewVariant 5 · 3 implementations · 10 checks per implementation

Case contract

Merge base, ours and theirs maps key by key over the union of keys; an absent key and a key holding null are different states. If ours and theirs agree, take that state; else if ours equals base take theirs; else if theirs equals base take ours; otherwise record a conflict and keep ours. Return sorted merged [key, value] pairs and sorted conflicting keys.

Why this case matters

Structured configuration and lock files are merged per key, where deletions and null values must stay distinguishable.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
key added only by theirs	`{"conflicts": [], "merged": [["host", "a"], ["mode", "x"], ["port", "80"]]}`	`{"conflicts": [], "merged": [["extra", "e5"], ["host", "a"], ["mode", "x"], ["port", "80"]]}`	Failed

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