Create an input contract with units and a missing-data policy. Supply at least one valid and two invalid cases.
Name the expected effect, metric and what would count against the hypothesis.
Record fixtures, source, version, parameters, units, controls and how cases are split.
| Case and split | Baseline result | Changed result | Interpretation |
|---|---|---|---|
A double conversion produces valid numbers but incorrect meaning, so simply adding a conversion step is insufficient.
Record your new case and rerun the original cases after redesign.
Explain the mechanism, one exact result and what would overturn your conclusion.
A contract prevents these declared errors only; acceptable conversions must be designed explicitly.
Next test: _ . Project filename: _ . Work that is mine and tools I used: ____ .
Use fictional data. Download a resumable project before changing devices. On a shared device, turn remembering off and clear your work when finished.