May 2026 monthly summary: Focused on enhancing type aliasing flexibility across modules by delivering writable __module__ for TypeAliasType in both CPython and typing_extensions, enabling cross-module type aliasing and dynamic module assignment. Updated internal structures and tests to support the new setter and verify behavior across multiple modules and Python versions. This work improves modularity, correctness, and long-term maintainability for projects relying on advanced type aliasing, with clear business value for multi-repo codebases and tooling. Overall impact: strengthened type system flexibility and module-scoping semantics in core type aliasing features, reducing friction for multi-module projects and enabling safer cross-module type alias usage. Technologies/skills demonstrated: Python type system, CPython internals, typing_extensions, unit testing, cross-repo collaboration, code instrumentation, and test-driven validation.