FA-100154 / Annotation span alignment / Member archive

Replacement length delta stretches later annotations · case 04

Replacement length delta stretches later annotations.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Replace [start,end) with new_length characters. Spans ending at or before start stay fixed; spans starting at or after end shift by delta; overlapping spans keep start and adjust end by delta.

Why this case matters

A small offline annotation transformation keeps span coordinates explicit when text or token boundaries change.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
after replacement	`[[9, 13]]`	`[[10, 13]]`	Failed

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