ty 0.0.91

on Python PyPI

Release Notes

Released on 2026-10-22.

Bug fixes

• Improve generics solving when an intersection is passed into a generic call to prefer solving the call to a more precise type when it is safe to do so (#29578)
• Fix recursive type materialization (#29532)
• Infer return intersections from correlated call specializations (#28303)
• Preserve Self when checking universal protocols (#29207)
• Fix stack overflows involving recursive descriptor setter types (#29148)
• Preserve the namespace-package fallback in module discovery when the namespace-package fallback is obscured by a partial stub package (#29559)
• Report all missing @override decorators together (#29557)
• Fix false-positive invalid-argument-type diagnostics when inferring constrained type variables from callbacks that return an invariant generic with a gradual type argument (#29577)

Performance improvements

• Compare protocol receiver restrictions before binding (#29443)

LSP server

• Avoid cancelling requests for unrelated file changes (#29604)

Core type checking

• Generics solving: check for unsatisfiable bodies before existentially quantifying (#29504)
• Liskov diagnostics: Check inherited attribute conflicts (#28559)
• Return type inference: eneralize nested types in inferred return types (#29488)

Contributors

• @charliermarsh
• @sharkdp
• @dhruvmanila
• @carljm
• @MichaReiser
• @dcreager

Install ty 0.0.91

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.91/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.91/ty-installer.ps1 | iex"

Download ty 0.0.91

Verifying GitHub Artifact Attestations

The artifacts in this release have attestations generated with GitHub Artifact Attestations. These can be verified by using the GitHub CLI:

gh attestation verify <file-path of downloaded artifact> --repo astral-sh/ty

You can also download the attestation from GitHub and verify against that directly:

gh attestation verify <file-path of downloaded artifact> --bundle <file-path of downloaded attestation>