FA-11604 / Compression format semantics / Member archive
Dictionary clear codes retain stale learned phrases · case 04
Dictionary clear codes retain stale learned phrases.
Case contract
Toy dictionary starts with {0:a,1:b}. Tokens [put,k,text] add phrases; [clear] restores exactly the literals; [get,k] emits the mapped phrase or ?.
Why this case matters
A small offline codec model isolates a compression-specific failure without external files or libraries.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| epoch invalidates phrase | ["aaaa"] | ["?"] | Failed |
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