FA-99672 / Chunk citation alignment / Member archive

Overlapping chunk citations include the already stitched prefix · case 02

Overlapping chunk citations include the already stitched prefix.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Chunks are source intervals [start,end] in ascending order, each next interval overlaps or touches the prior covered frontier; stitching retains the first chunk in full and discards duplicate prefixes. Citation [chunk_index,local_start,local_end] maps to the nonempty retained piece in output-local coordinates, or None if fully overlapped.

Why this case matters

A deterministic citation bookkeeping model isolates source attribution from rendering and retrieval.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
citation straddles duplicated prefix	`[1, 4]`	`[5, 7]`	Failed

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