FA-10418 / Caching / Member archive

Creating a record leaves its cached absence visible · case 03

Creating a record leaves its cached absence visible.

Member previewVariant 3 · 3 implementations · 4 checks per implementation

Case contract

Write-through creation stores the supplied value under key whether the cache held an old value, negative None, or no entry; unrelated entries are preserved.

Why this case matters

A deterministic cache state transformation. Inputs are copied or treated as immutable; no remote storage, real clock, or concurrent interleaving is simulated.

One recorded failure

Sample boundary fixture

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

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

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