fix(deps): update dependency ty to v0.0.89

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
ty (changelog)	==0.0.85 → ==0.0.89

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Release Notes

astral-sh/ty (ty)

v0.0.89

Compare Source

Released on 2026-10-16.

Core type checking

• Added support for return type inference for unannotated functions and methods (#​29253).

  Return type inference is currently disabled by default. Enable it with the analysis.return-type-inference setting in pyproject.toml:

  [tool.ty.analysis]
  return-type-inference = "always"

  Or in ty.toml:

  [analysis]
  return-type-inference = "always"

  Please share your feedback, especially any problems you encounter, in the return type inference feedback issue.

• Sync vendored typeshed stubs (#​29402). Typeshed diff

Bug fixes

• Avoid a panic when negating dynamic type aliases (#​29427)
• Widen tuple literal lengths when other collection elements contain nested tuple types (#​29147)
• Report invalid Generic and Protocol arguments containing nested variadic type variables (#​29146)

Performance

• Speed up generic class-pattern narrowing by skipping impossible intersection comparisons (#​29240)

Contributors

• @​carljm
• @​charliermarsh
• @​sharkdp

v0.0.88

Compare Source

Released on 2026-10-15.

Bug fixes

• Avoid panics and hangs involving recursive type aliases and intersections (#​29057)
• Fix false invalid-mutable-override errors when overriding object attributes (#​29373)
• Fix attribute assignment and deletion checks through bounded or constrained type variables (#​29345)
• Detect instance layout conflicts hidden by additional base classes (#​29372)
• Fix false missing-argument errors when Pydantic models override inherited attributes with ClassVar (#​29367)
• Preserve known module owners when uv reports owners outside the resolution (#​29296)

Diagnostic improvements

• Report assignments to individually frozen Pydantic fields (#​29305)

Core type checking

• Improve type inference for intersection arguments to generic functions (#​28677)
• Preserve inherited annotations for unannotated subclass attributes when a base has type Any or Unknown (#​28973)
• Preserve common return-type structure when gradual arguments match multiple overloads (#​29342)
• Check upper bounds when inferring type variables from caller type variables (#​29014)

Contributors

• @​zaniebot
• @​charliermarsh
• @​zhouzaida
• @​seunghyun-24
• @​zsol
• @​RasmusNygren
• @​carljm

v0.0.87

Compare Source

Released on 2026-10-13.

LSP server

• Clamp notebook cell positions to the end of the cell (#​29307)
• Fix deadlock when requests arrive before workspace configuration (#​29303)
• Fix notebook cell lookups after cells with cell magics (#​29308)
• Fix panic on completions past the end of a notebook's last cell (#​29306)

Diagnostic improvements

• Add opt-in mismatched-sentinel-name rule (#​27206)
• Deduplicate identical argument type diagnostics (#​29337)
• Enable invalid-mutable-override by default (#​29335)
• Improve display of distinct string literal types (#​29206)
• Respect suppression of attribute override diagnostics (#​29327)

Core type checking

• Check overrides of receiver attribute declarations (#​28557)
• Infer the default for definitely absent keys in closed TypedDict.get calls (#​29136)
• Leave room for later positional arguments when unpacking a variable-length argument (#​29293)
• Preserve minimum lengths of unpacked tuple unions (#​29331)
• Specialize bare generic class name with type[...] type context (#​29248)

Performance

• Avoid constructing nominal complements (#​29292)
• Optimize system path equality (#​29340)

Contributors

• @​charliermarsh
• @​AlexWaygood
• @​ibraheemdev
• @​zsol
• @​Amirshox
• @​carljm

v0.0.86

Compare Source

Released on 2026-10-09.

The executables in our macOS and Windows release archives and ty wheels are now code-signed.
macOS executables are signed with an Apple Developer ID certificate and notarized by Apple. Windows
executables have timestamped Authenticode signatures from Azure Artifact Signing. This enables
verification of the release publisher and binary integrity, supports publisher-based allowlisting,
and should reduce security warnings and antivirus false positives.

Bug fixes

• Infer empty collection branches from nonempty literals (#​29131)
• Invalidate dependency metadata when environments change (#​29126)
• Preserve final attribute restrictions on composite types (#​29135)
• Preserve recursive structure in Annotated values (#​29058)
• Specialize inherited dataclass field converters (#​29192)

LSP server

• Show documentation for annotation operators on hover (#​29185)

Core type checking

• Check attribute and property override types (#​28556)
• Narrow tuple unions through truthiness and type checks (#​29125)
• Preserve literal types when consuming dictionary literals (#​29145)
• Preserve non-boolean comparison results for intersections (#​28045)
• Preserve receiver specializations when calling unions of bound methods (#​29015)
• Represent uninhabited truthiness explicitly (#​28843)
• Solve validity type context through constraint sets (#​28909)

Performance

• Avoid recursion guards for non-generic nominal targets (#​29202)
• Check exact exclusions before intersection positives (#​29195)

Memory usage improvements

• Share constraints in retained sequent maps (#​28966)

Other changes

• Update the default Python version to 3.15 (#​28792)
• Update to Unicode 17 (#​21229, #​28784)
• Always show fixes in the CLI (#​27810)

Contributors

• @​gorewilliams
• @​carljm
• @​AlexWaygood
• @​ibraheemdev
• @​zsol
• @​charliermarsh

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