FA-18499 / Time representation / Member archive

Holdover admission fabricates missing history or admits future sync · case 04

The decoded time state disagrees with the explicit regression oracle for history.

Member previewVariant 4 · 3 implementations · 13 checks per implementation

Case contract

Clock quality state is determined from oscillator validity, acquisition lock count, elapsed time since last sync, max holdover, phase jump and lock threshold. Unknown oscillator is invalid; otherwise large phase jump requires reacquisition, recent sufficient lock is synchronized, old but bounded history is holdover, and missing/expired history is unsynchronized. Return usability and conservative uncertainty growth for holdover only.

Why this case matters

Clock transfer and timestamp consumers require preserved coordinate, phase, validity and elapsed-time semantics.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
fixture 7	`["locked", 2, true]`	`["unsynced", null, false]`	Failed

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