Bump mypy from 1.20.2 to 2.0.0

[dependabot]

Bumps mypy from 1.20.2 to 2.0.0.

Changelog

Sourced from mypy's changelog.

Mypy Release Notes

Next Release

Mypy 2.1

We’ve just uploaded mypy 2.1.0 to the Python Package Index (PyPI). Mypy is a static type checker for Python. This release includes new features, performance improvements and bug fixes. You can install it as follows:

python3 -m pip install -U mypy

You can read the full documentation for this release on Read the Docs.

librt.vecs: Fast Growable Array Type for Mypyc

The new librt.vecs module provides an efficient growable array type vec that is optimized for mypyc use. It provides fast, packed arrays with integer and floating point value types, which can be several times faster than list, and tens of times faster than array.array in code compiled using mypyc. It also supports nested vec objects and non-value-type items, such as vec[vec[str]].

Refer to the documentation for the details.

Contributed by Jukka Lehtosalo.

librt.random: Fast Pseudo-Random Number Generation

The new librt.random module provides fast pseudo-random number generation that is optimized for code compiled using mypyc. It can be 3x to 10x faster than the stdlib random module in compiled code.

Refer to the documentation for the details.

Contributed by Jukka Lehtosalo (PR 21433).

Mypyc Improvements

• Make compilation order with multiple files consistent (Piotr Sawicki, PR 21419)
• Fix crash on accessing StopAsyncIteration (Piotr Sawicki, PR 21406)
• Fix incremental compilation with separate flag (Vaggelis Danias, PR 21299)

Fixes to Crashes

• Fix crash on partial type with --allow-redefinition and global declaration (Jukka Lehtosalo, PR 21428)
• Fix broken awaitable generator patching (Ivan Levkivskyi, PR 21435)

Changes to Messages

... (truncated)

Commits

• 7a76500 Remove +dev from version
• 5a3ab3b Changelog for mypy 2.0 (#21422)
• f9c86e2 Some changelog updates for 2.0 (#21413)
• 519eaf1 Bump librt to 0.10.0 (#21415)
• 158a620 Fix negative narrowing for containers (#21411)
• e556eb9 Try fixing mypy mypyc wheels (#21392)
• f2c9797 Expose --num-workers and --native-parser (#21387)
• db0cb2f Bump ast-serialize cache version (#21388)
• 1090ca6 Bump ast-serialize version to 0.3.0 only (#21391)
• 714ca9f [mypyc] Add note about librt.strings thread safety (#21383)
• Additional commits viewable in compare view

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[github-actions]

🤖 Claude Code Review

Code Review

PR: Bump mypy from 1.20.2 to 2.0.0

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Code Quality

• ✅ Style guide — Single-line change in pyproject.toml, no style concerns.
• ✅ No commented-out code — N/A.
• ✅ Meaningful variable names — N/A.
• ✅ DRY principle — N/A.
• ✅ Defects — No logic errors. This is a dependency version bump in the lint extras group. mypy 2.0.0 is a major version bump and may introduce stricter type checking that breaks existing code, but that's an expected and manageable side effect of upgrading linting tools. Developers should run make mypy to verify no new type errors are surfaced.
• ✅ CLAUDE.md — No issues. The project's CLAUDE.md is general and appropriate.

Testing

• ✅ Unit/integration tests — N/A for a dependency version bump in the lint group. This change only affects the linting toolchain, not runtime behavior.
• ✅ Edge cases — N/A.
• ✅ Coverage — N/A.

Documentation

• ❌ CHANGELOG.md — Not updated. Dependency bumps should typically be recorded in the changelog. Please verify whether this project tracks dependency updates in CHANGELOG.md.
• ✅ README / API docs / inline comments — N/A.
• ✅ Markdown formatting — N/A.

Security

• ✅ No hardcoded credentials — N/A.
• ✅ Input validation / error handling / sensitive data — N/A.
• ✅ No license files (.lic) — None present.

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Summary

Minimal, low-risk change. The only flag is the missing CHANGELOG entry. Given mypy 2.0.0 is a major version, it's worth confirming make mypy passes cleanly before merging.

Automated code review analyzing defects and coding standards