FA-17587 / Time representation / Member archive

Calibration support classifies anchors as extrapolation · case 02

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

Member previewVariant 2 · 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 4	`["2", "5", "5", "0", "0", -1]`	`["2", "5", "5", "0", "0", 0]`	Failed

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

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