FA-100172 / Annotation span alignment / Member archive

Adjacent same-label spans remain fragmented · case 02

Adjacent same-label spans remain fragmented.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Input spans are ordered [start,end,label]. Merge touching or overlapping spans with equal labels; preserve input order and keep different labels separate.

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
adjacent same label	`[[0, 2, "a"], [2, 4, "a"]]`	`[[0, 4, "a"]]`	Failed

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