FA-100662 / Speculative decoding bookkeeping / Member archive
Decoding: Rollback removes only the final draft token · case 02
Rollback removes only the final draft token.
Case contract
Keep the first k draft tokens and discard the rejected token plus all later draft tokens.
Why this case matters
A self-contained bookkeeping model makes prefix and token-count semantics observable without a model runtime.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| middle rollback | [1, 2, 3] | [1, 2] | Failed |
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