FA-18642 / Time representation / Member archive

Era anchor truncates negative eras or uses maximum label as period · case 02

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

Member previewVariant 2 · 3 implementations · 18 checks per implementation

Case contract

Controlled week counter has 1024-week eras. A received low week 0..1023 and tick-within-week 0..99 must resolve near trusted absolute reference week, considering neighboring eras. Pick minimum absolute week distance; ties are ambiguous and rejected. Also require distance within trust radius. Report accepted absolute week/tick plus ambiguity, distance and selected era. No GNSS standards compliance is claimed. A nonnegative reference uncertainty invalidates selection if nearest distance plus uncertainty reaches the 512-week half-era boundary.

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 13	`[-1, -100, false, 512, -1]`	`[null, null, true, 512, null]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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