FA-98594 / KV cache position mapping / Member archive
Sink tokens survive rolling-window eviction · case 04
Eviction removes the initial sink positions along with stale middle positions.
Case contract
Given ordered (position,value) entries, retain positions below sink_count or in the inclusive window [current-window+1,current].
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 |
|---|---|---|---|
| sink and recent | [[7, 7], [8, 8], [9, 9]] | [[0, 0], [1, 1], [7, 7], [8, 8]] | Failed |
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