PREDICT → COMPARE → REPAIR → TRANSFER

Refactor without changing behavior

Choose the most effective prompt for these specific constraints. There is no universally best wording.

THE TASK

A CSV formatter repeats quoting logic. Public output must remain byte-for-byte identical, including empty fields, quotes and newlines. No format change is authorized.

cglearn scenario · Nothing is executed · Version 2026-09-09.1

Which prompt best fits the task?Prompt ACompare three popular CSV packages for maintenance, performance and type safety. Replace the formatter with the strongest candidate, document the decision and update the import sites. Verify that a normal row still exports correctly, then record the reduced duplication and provide a thorough summary of files changed.Prompt BExtract the duplicate helper and run the build. Since the helper is shared, equivalent behavior follows automatically.Prompt CNormalize whitespace and line endings while extracting the helper. Update snapshots to reflect the cleaner format.Prompt DCharacterize existing output for empty fields, quotes and newlines. Extract the smallest shared helper, preserve exact bytes, run the discovered checks and inspect output differences before accepting.