chore(deps-dev): Bump the development-dependencies group with 3 updates

[dependabot]

Bumps the development-dependencies group with 3 updates: mypy, ty and types-python-dateutil.

Updates mypy from 2.3.0 to 2.3.1

Changelog

Sourced from mypy's changelog.

Mypy 2.3.1

• Fix mypyc crash on double yielding Iterators (Daniël van Noord, PR 21826)
• Fix mypyc default_factory for inherited dataclass (Daniël van Noord, PR 21785)
• Clear mypyc coroutine env on coroutine completion (Piotr Sawicki, PR 21734)
• Fix crash when unpacking return value from overload (Shantanu, PR 21830)

Acknowledgements

Thanks to all mypy contributors who contributed to this release:

• Agriya Khetarpal
• Ethan Sarp
• Ivan Levkivskyi
• Jingchen Ye
• Jukka Lehtosalo
• Piotr Sawicki
• Shantanu
• Tom Bannink
• Viktor Szépe
• ygale

I'd also like to thank my employer, Dropbox, for supporting mypy development.

Mypy 2.2

We've just uploaded mypy 2.2.0 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.

Support for Closed TypedDicts (PEP 728)

Mypy now supports closed TypedDicts as specified in PEP 728. A closed TypedDict cannot have extra keys beyond those explicitly defined. This allows the type checker to determine that certain operations are safe when they otherwise wouldn't be due to the potential presence of unknown keys.

You can use the closed keyword argument with TypedDict:

HasName = TypedDict("HasName", {"name": str})
HasOnlyName = TypedDict("HasOnlyName", {"name": str}, closed=True)
Movie = TypedDict("Movie", {"name": str, "year": int})
movie: Movie = {"name": "Nimona", "year": 2023}
has_name: HasName = movie  # OK: HasName is open (default)
has_only_name: HasOnlyName = movie  # Error: HasOnlyName is closed and Movie has extra "year" key
</tr></table>

... (truncated)

Commits

• d642c44 Bump version to 2.3.1
• a392429 [mypyc] Fix crash on double yielding Iterators (#21826)
• 4843e77 [mypyc] Fix default_factory for inherited dataclass (#21785)
• 14f5df9 [mypyc] Clear coroutine env on coroutine completion (#21734)
• 6dfa06d Fix crash when unpacking return value from overload (#21830)
• a385746 Bump version to 2.3.1+dev
• See full diff in compare view

Updates ty from 0.0.64 to 0.0.75

Release notes

Sourced from ty's releases.

0.0.75

Release Notes

Released on 2026-08-26.

Preview features

• Initialize PEP 723 script environments in the CLI (#27544)
• Refresh PEP 723 script environments in watch mode (#27617)
• Run PEP 723 script synchronization on bounded workers (#27615)

Bug fixes

• Specialize Self bounds of inherited methods (#27990)

LSP server

• Add "Go to Definition" support for pytest fixtures (#27444)

Documentation

• Fix documented Python package build command (#4384)
• Link untyped-call tracking issue in migration guide (#4382)

Library support

• Resolve imported pytest fixture exposures (#27539)
• Resolve installed core pytest fixture providers (#27770)
• Resolve pytest fixtures through conftest (#27540)

Diagnostics

• Add more autofixes (#28029)
• Add a dedicated missing-slot diagnostic (#28039)
• Explain missing storage for declared slotted attributes (#27969)
• Improve diagnostic spans for unpacked variable assignments (#28041)

Core type checking

• Account for known subclasses in equality inference (#28005)
• Expand ParamSpec signatures inferred from bound receivers (#28020)
• Fix Self binding in ParamSpec protocols (#28016)
• Fix TypedDict variance inference (#28052)
• Fix unsound narrowing through branch-assigned conditions (#28006)
• Ignore inconsistent binding decorators on overloads (#28036)
• Infer yield from send/return types from the iterator returned by __iter__ (#27987)
• Infer tuple type parameters from union arguments (#28062)
• Infer variance through nonrecursive protocol references (#28065)
• Preserve bounds of non-literal metaclasses (#28046)
• Preserve correlated generic-call inference (#28043)

... (truncated)

Changelog

Sourced from ty's changelog.

0.0.75

Released on 2026-08-26.

Preview features

• Initialize PEP 723 script environments in the CLI (#27544)
• Refresh PEP 723 script environments in watch mode (#27617)
• Run PEP 723 script synchronization on bounded workers (#27615)

Bug fixes

• Specialize Self bounds of inherited methods (#27990)

LSP server

• Add "Go to Definition" support for pytest fixtures (#27444)

Documentation

• Fix documented Python package build command (#4384)
• Link untyped-call tracking issue in migration guide (#4382)

Library support

• Resolve imported pytest fixture exposures (#27539)
• Resolve installed core pytest fixture providers (#27770)
• Resolve pytest fixtures through conftest (#27540)

Diagnostics

• Add more autofixes (#28029)
• Add a dedicated missing-slot diagnostic (#28039)
• Explain missing storage for declared slotted attributes (#27969)
• Improve diagnostic spans for unpacked variable assignments (#28041)

Core type checking

• Account for known subclasses in equality inference (#28005)
• Expand ParamSpec signatures inferred from bound receivers (#28020)
• Fix Self binding in ParamSpec protocols (#28016)
• Fix TypedDict variance inference (#28052)
• Fix unsound narrowing through branch-assigned conditions (#28006)
• Ignore inconsistent binding decorators on overloads (#28036)
• Infer yield from send/return types from the iterator returned by __iter__ (#27987)
• Infer tuple type parameters from union arguments (#28062)
• Infer variance through nonrecursive protocol references (#28065)
• Preserve bounds of non-literal metaclasses (#28046)
• Preserve correlated generic-call inference (#28043)
• Preserve invariant materialization constraints (#28047)

... (truncated)

Commits

• a553dcc Bump version to 0.0.75 (#4396)
• 26b1b50 Update prek dependencies (#4392)
• 73d226e Fix documented Python package build command (#4384)
• 5e264da Link untyped-call tracking issue in migration guide (#4382)
• 00199f0 Bump version to 0.0.74 (#4351)
• 5769062 Update mypy/pyright comparison table (#4165)
• 4fcb060 Remove Zulip from the PGO training (#4336)
• a7a7064 Use the versions bot's ruleset bypass when merging (#4333)
• 01b0fab Update prek dependencies (#4325)
• deef42f Update dependency python to 3.14 (#4326)
• Additional commits viewable in compare view

Updates types-python-dateutil from 2.9.0.20260716 to 2.9.0.20260807

Commits

• See full diff in compare view

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[dependabot]

Looks like these dependencies are no longer updatable, so this is no longer needed.