Refactor With the Constraints Stated

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The Prompt
Refactor the [LANGUAGE] code below.

CONSTRAINTS — these are hard:
- Language/runtime version: [VERSION]. Do not use anything newer.
- Behaviour must be identical, including error cases and edge cases.
- Keep the public signature unless I say otherwise.
- Match the surrounding style: naming, comment density, idiom.

Goals, in priority order: correctness, then readability, then performance.

Return:
1. The refactored code
2. A numbered list of every change and the reason
3. Anything you noticed that is a real bug — separately, NOT fixed inline, so I can decide
4. Any behaviour you could not preserve, stated plainly

If the code is already fine, say so instead of churning it.

CODE:
[CODE]
Variables — replace these:
[CODE]· The code to refactor [LANGUAGE]· e.g. PHP, TypeScript, Python [VERSION]· e.g. PHP 8.1, Node 18
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Prompt Details
CategoryCoding & Development
Typecode
Difficultyintermediate
Tokens380
CreatedAug 14, 2026
UpdatedAug 14, 2026
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