FA-98128 / Sequence batch packing / Member archive

Prompt tokens leak into response-only truncation · case 03

Prompt tokens leak into response-only truncation.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Return response tokens only, preserving the full response when it fits and otherwise retaining its final limit tokens; output (tokens, response_start), where response_start is zero.

Why this case matters

This deterministic toy packing rule models a common boundary in preparing bounded training sequences.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
response fits	`[[0, 1, 2, 3, 4, 8, 9], 5]`	`[[8, 9], 0]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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