FA-98542 / KV cache position mapping / Member archive

Absolute positions map relative to the cache origin · case 02

Writes land at an absolute index instead of an index relative to the cache origin.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

For inclusive logical positions [origin, position], return (logical, slot_origin + logical - origin) pairs. position before origin yields an empty list.

Why this case matters

A small in-memory model makes the cache address contract explicit for a serving component.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
shifted window	`[[2, 2], [3, 3], [4, 4]]`	`[[2, 7], [3, 8], [4, 9]]`	Failed

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

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