FA-17727 / Time representation / Member archive

Gap repair exposes local coordinate as UTC · case 02

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

Member previewVariant 2 · 3 implementations · 11 checks per implementation

Case contract

A stipulated forward offset transition at UTC T creates local gap [T+old,T+new). Reject returns None, forward adds gap width and backward subtracts it, preserving position in the gap. Return resolved local coordinate, UTC coordinate, shift direction and successful-change flag. Outside-gap labels are unchanged.

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	`[109, 109, 0, false]`	`[109, 99, 0, false]`	Failed

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

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