Code Explainer

Explain this {language} code snippet to a {level} developer:

```{language}
{code}
```

Structure:
1. What it does — one sentence, no jargon
2. How it works — walk through line by line
3. When to use it — a concrete use case
4. Edge cases / gotchas — at least 2 real ones a {level} would miss
5. A better/simpler alternative, if any exists

Be specific. If anything in the code is non-obvious or clever, call it out.

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