FA-98637 / KV cache position mapping / Member archive
Prefix reuse rounds down to complete cache blocks · case 02
A partial cache block is claimed as reusable.
Case contract
Return the longest common token prefix length rounded down to a multiple of positive block_size.
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 |
|---|---|---|---|
| partial block | 3 | 0 | Failed |
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