FA-18204 / Time representation / Member archive

Split timestamp admits unnormalized fraction endpoint · case 04

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

Member previewVariant 4 · 3 implementations · 15 checks per implementation

Case contract

Controlled timestamp migration from version 1 milliseconds or version 2 split seconds/nanos into exact nanoseconds. A separate presence bit distinguishes missing from epoch zero. Version 2 fraction must be 0..999999999; timezone offsets are forbidden because payload is already UTC. Preserve uncertainty in matching units and emit canonical seconds/remainder with precision and provenance. Negative uncertainty is invalid; zero means exact.

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 6	`["ok", [2, 0, 2, 1]]`	`["invalid", null]`	Failed

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