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Explicit configuration overlay: Earlier configuration layers override later ones · case 03

Earlier configuration layers override later ones.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Merge mappings left to right. None deletes a key, false and zero are retained, lists replace instead of concatenate, and mapping values replace atomically.

Why this case matters

An offline model of explicit configuration overlay, suitable for testing build and release tooling without external services.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
fixture 2	`{"a": 1}`	`{"a": 2}`	Failed

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