FA-18004 / Time representation / Member archive

Exchange delay normalization hides physically impossible negative propagation · case 04

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

Member previewVariant 4 · 3 implementations · 11 checks per implementation

Case contract

Four timestamps are ordered by message path: client send c0, server receive s1, server send s2, client receive c3. Constant offset server-minus-client is estimated by symmetric path assumption. Preserve exact half-tick fractions; report network round trip, offset, projected server now, local send/receive server equivalents, one-way path estimate and delay bounds from nonnegative path delays.

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	`[true, "5/2", "65/2", "0", [5, 0], "-5/2", "25/2", "35/2"]`	`[false, "5/2", "65/2", "-5/2", [5, 0], "-5/2", "25/2", "35/2"]`	Failed

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

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