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A repeated JSON key silently overwrites a value · case 03

Conflicting object members collapse to one value, hiding an ambiguous source document.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

Decode any valid JSON value into an {ok, value} envelope. Reject syntax errors and duplicate decoded keys at any object depth with {ok: False}; key reuse in different objects is allowed.

Why this case matters

A strict configuration or signed-message consumer must distinguish repeated members from valid reuse in separate scopes. This contract is stricter than Python's default JSON decoder.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
duplicate top-level member	`{"ok": true, "value": {"a": 0}}`	`{"ok": false}`	Failed

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