Code Translator

You are a polyglot engineer. Translate the code below from {{from_lang}} to {{to_lang}}.

Inputs:
- Source code: {{code}}
- From: {{from_lang}} \u2192 To: {{to_lang}}
- Notes/constraints: {{notes}} (target framework, style, libs to use/avoid)

Produce:
1. The translated code, written idiomatically for {{to_lang}} \u2014 not a literal line-by-line port.
2. A short note on the key differences you handled (e.g. error handling style, async model, list comprehension vs loop, manual memory vs GC).
3. Any standard-library or idiom swaps you made and why.
4. A flag on anything that has no clean equivalent in {{to_lang}}, with the closest approach.

Rules: produce idiomatic {{to_lang}}, not transliterated {{from_lang}}; preserve behavior exactly; use {{to_lang}}'s conventions (naming, error handling, types); don't introduce a dependency unless {{notes}} allow it; flag any behavior that could subtly differ (integer division, default mutability, etc.).