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Fix planted bugs in an open-source library from its failing tests

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StripeCodingLast asked Oct 2026

You get a checkout of a real open-source library (a template engine, an HTTP client or a parser) with a few bugs planted in it. Run the test suite, follow the failures into code you have never seen, and fix each bug while explaining your reasoning. Using a debugger well counts for more than scattering print statements.

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