FA-17548 / Time representation / Member archive

Reference span mixes device and reference anchors · case 03

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

Member previewVariant 3 · 3 implementations · 11 checks per implementation

Case contract

Two increasing device/reference calibration pairs define a positive exact affine clock mapping. Return rational slope/intercept, mapped device reading, signed observation-minus-prediction residual, inverse-mapped observed reference, and extrapolation direction (-1 before support, 0 within including anchors, 1 after). Fractions serialize canonically as strings.

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 1	`["7/2", "3", "17", "-3", "22/7", 0]`	`["3/2", "7", "13", "1", "14/3", 0]`	Failed

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