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Context coverage interleaves document chunks without breaking prefixes · case 02

Context coverage interleaves document chunks without breaking prefixes.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

Rows are [document,ordinal,text,cost] with unique contiguous ordinals per document. In first-seen document order, emit one next chunk per pass; each document contributes only a contiguous ordinal prefix. Skip a document after its next chunk cannot fit the remaining budget. Return [document,ordinal,text] rows.

Why this case matters

A small deterministic evidence assembly model makes context budgeting behavior inspectable.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
round robin keeps local order	`[["doc2", 0, "a0"], ["doc2", 1, "a1"], ["other2", 0, "b0"], ["other2", 1, "b1"]]`	`[["doc2", 0, "a0"], ["other2", 0, "b0"], ["doc2", 1, "a1"]]`	Failed

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