FA-98230 / Attention mask construction / Member archive
Global keys remain hidden from earlier queries · case 05
Global keys remain hidden from earlier queries.
Case contract
Causal visibility plus globally visible key indices; special query positions still obey causality.
Why this case matters
A small explicit visibility matrix makes sequence-attention boundary behavior reviewable.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| global-key exception applies to a query row | [true, false, false] | [true, true, false] | Failed |
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