FA-17984 / Time representation / Member archive

Equal point labels conceal different represented precision intervals · case 04

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

Member previewVariant 4 · 3 implementations · 11 checks per implementation

Case contract

A timestamp rounded down to resolution q represents half-open [stamp,stamp+q). Preserve domain tag; q positive. Comparing two buckets yields exact intersection and possible/definite-before relations, equality of represented sets and union envelope. Query membership is half-open. This model handles precision buckets, not point timestamps.

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 3	`[[10, 12], false, true, true, true, [10, 20]]`	`[[10, 12], false, true, false, true, [10, 20]]`	Failed

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