Developer ports Python semantic versioning library to Rust in 72-hour hackathon

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A solo developer rewrote the Python library python-semanticversion in Rust during Port Mortem 2026, a 72-hour hackathon challenging participants to migrate abandoned Python code to Rust. The port, built using PyO3 and maturin, passed the original unmodified pytest suite with 54 tests passing, 16 skipped, and 586 subtests, with no changes to the test files. To ensure correctness beyond the test suite, the developer ran differential fuzzing across 24,500 random input pairs and crash fuzzing over 2.5 million runs, recording zero panics and no hard divergences. The process uncovered eight bugs in the Rust port, including 18 integer overflow sites stemming from differences between Python's arbitrary-precision integers and Rust's fixed-width u64 type. The developer documented every significant design decision in a dedicated log, noting deliberate quirks in the original Python library that required careful handling to preserve exact behavioral parity.

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