FA-11592 / Compression format semantics / Member archive

LZ match copying freezes the source before expansion · case 02

LZ match copying freezes the source before expansion.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

For a nonempty seed, valid distance into seed, and nonnegative length, append length symbols by repeatedly reading distance symbols behind the growing output.

Why this case matters

A small offline codec model isolates a compression-specific failure without external files or libraries.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
overlap	`"abab"`	`"abababa"`	Failed

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