Before writing a port, extract the upstream algorithm with file paths and line numbers — a 'code archaeology' phase. The port then becomes a faithful translation rather than a re-imagining, which means the output is verifiable against existing reference artifacts. The four sub-problems to lift in order: identifier generation, template/syntax glue, incremental-update diff logic, and default output structure. Each maps to a single function or template that can be transliterated mechanically once located.
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