FA-100157 / Annotation span alignment / Member archive
Token index maps to the wrong character boundary · case 02
Token index maps to the wrong character boundary.
Case contract
Given token intervals [start,end), return the start offset at index i; index equal to token count maps to final end; invalid indices return -1.
Why this case matters
A small offline annotation transformation keeps span coordinates explicit when text or token boundaries change.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| negative index | 1 | -1 | Failed |
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