FA-100199 / Annotation span alignment / Member archive

Boundary-touching spans pass a containment filter · case 04

Boundary-touching spans pass a containment filter.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Return input spans fully contained in [left,right), including equal boundaries; zero-width candidates are allowed when their point is within the closed boundary range.

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
starts before	`[[0, 4, "a"]]`	`[]`	Failed

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