Systematically add type annotations to an existing Python codebase with mypy integration, gradual typing strategies, and CI enforcement for improved code quality.
## CONTEXT Microsoft's research on the TypeScript migration of their JavaScript codebases found that static typing prevents 15% of production bugs that would otherwise reach users. Python's optional type system, formalized in PEP 484 and dramatically improved through PEP 604, 612, and 695, offers the same benefits…
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