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

PR Code Review

Summary: This PR bumps mypy from 1.20.2 to 2.0.0 in pyproject.toml.

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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 introduced. mypy 2.0.0 is a major version bump; mypy 2.x dropped support for Python 3.8 and introduced breaking changes in some type inference. However, since the project's pyproject.toml already restricts to Python > 3.11 in other dependencies, this should be fine. Worth verifying CI passes cleanly.
• ✅ CLAUDE.md — No issues; the project config file is appropriately general.

Testing

• ✅ Unit/integration tests — No new code requiring tests.
• ❌ Test coverage — No evidence that mypy type-checking still passes after the upgrade. mypy 2.0.0 introduced stricter inference and removed some deprecated features. CI results confirming a clean mypy run would strengthen this PR.

Documentation

• ✅ README — No changes needed for a dev-dependency bump.
• ✅ API docs — N/A.
• ✅ Inline comments — N/A.
• ❌ CHANGELOG.md — No CHANGELOG.md update was included. Dependency upgrades, especially major version bumps, are typically noted.
• ✅ Markdown formatting — N/A.

Security

• ✅ No hardcoded credentials — N/A.
• ✅ Input validation — N/A.
• ✅ Error handling — N/A.
• ✅ No sensitive data in logs — N/A.
• ✅ No license files — N/A.

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Summary

The change is minimal and low-risk. Two items to address:

1. CHANGELOG.md (pyproject.toml:74) — Add an entry noting the mypy 1.20.2 → 2.0.0 upgrade.
2. CI verification — Confirm mypy passes cleanly under 2.0.0; the major bump includes stricter type inference that could silently introduce new errors if CI isn't green.

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Automated code review analyzing defects and coding standards