FA-98567 / KV cache position mapping / Member archive
Left padding does not consume logical positions · case 02
Position IDs include the leading pad cells.
Case contract
For a row of booleans where true means a real token, return position IDs beginning at zero for real tokens and -1 for pads.
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 |
|---|---|---|---|
| left pad | [0, 1, 2, 3] | [-1, -1, 0, 1] | Failed |
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