FA-223 / Serialization / Member archive

Sorting only the root leaves unstable nested JSON output · case 03

Equivalent nested objects produce different byte strings depending on insertion order.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Serialize a JSON-compatible object with string keys using Python's JSON representation, recursive key sorting, no optional spaces, literal Unicode, and finite numbers only. Return None for unsupported values. This is a specified deterministic format, not a claim of RFC 8785 conformance.

Why this case matters

Bytewise snapshots and content digests require deterministic nested serialization. Sorting only the visible outer map leaves hidden order dependence.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
root ordering	`"{\"z\":3,\"a\":0}"`	`"{\"a\":0,\"z\":3}"`	Failed

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