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Overflow CSV columns overwrite the final header · case 05
Overflow CSV columns overwrite the final header.
Case contract
Read two-column a,b CSV as a dictionary, storing overflow cells under extra and missing b as None.
Why this case matters
A local executable model for consumers of structured text; oracle values are authored literals, not outputs copied from the repaired implementation.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| boundary 1 | {"a": "1", "b": "2"} | {"a": "1", "b": "2", "extra": ["3"]} | Failed |
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