FA-17495 / Time representation / Member archive

Backward projection suppresses oscillator error growth · case 05

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

Member previewVariant 5 · 3 implementations · 11 checks per implementation

Case contract

Project a center with asymmetric early/late error through signed elapsed ticks. Error growth uses elapsed magnitude and independent parts-per-thousand bounds rounded outward. Return projected [low,high], full width, zero containment, earliest/latest signed query duration and strict certainty of preceding query.

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 2	`[[-4, -4], 0, false, [4, 4], true]`	`[[-6, -3], 3, false, [3, 6], true]`	Failed

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

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