Site removed .html extensions from URLs after 24 years because someone said they looked outdated like files.

Hypothesis can randomly generate schemas (not just data) to test a Hasher class, avoiding false positives from type mismatches like [0] vs [False].

Author creates a fingerprinting class for nested data structures but struggles to write comprehensive tests for all possible data shapes.

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Mocking in the wrong location may work initially but breaks later when code changes, causing hard-to-debug test failures.