FA-11609 / Compression format semantics / Member archive

Canonical Huffman codes advance without shifting at length changes · case 04

Canonical Huffman codes advance without shifting at length changes.

Member previewVariant 4 · 3 implementations · 6 checks per implementation

Case contract

Given valid nonzero Huffman lengths keyed by symbol, return integer codes assigned by ascending (length,symbol), incrementing then left-shifting when length grows. Empty input returns {}.

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
length jump	`{"a": 0, "b": 1}`	`{"a": 0, "b": 32}`	Failed

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