FA-98590 / KV cache position mapping / Member archive
Sliding eviction retains one stale position · case 05
A key just outside the trailing window remains in the cache.
Case contract
Filter (position,value) entries to the inclusive trailing window ending at current_position. Window is positive.
Why this case matters
A small in-memory model makes the cache address contract explicit for a serving component.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| inclusive lower edge | [[5, "5"], [6, "6"], [7, "7"], [8, "8"]] | [[6, "6"], [7, "7"], [8, "8"]] | Failed |
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