astral-sh/ty 0.0.64

on GitHub

Release Notes

Released on 2026-07-27.

Bug fixes

• Fix identity narrowing for NewTypes (#26439)
• Make reachability analysis idempotent (#27163)

LSP server

• Fix ParamSpec declaration hover and type navigation (#27183)
• Implement LSP textDocument/implementation request (#25410)
• Introduce shared primitives for parsing backticks in docstrings (#26928)
• Render NumPy docstrings as structured Markdown (#25925)

CLI

• Add --exclude-scripts and --include-scripts (#27169)
• Discover uv workspace roots (#25551)

Diagnostics

• Add a lint rule for combined abstract and final decorators (#26932)
• Change --add-ignore to add space after the colon for ty: ignore (#27120)
• Fix missing-override-decorator suggestion before Python 3.12 (#27166)
• Reuse full call diagnostics for implicit setter calls (#27115)

Configuration

• Allow unresolved unused venv home paths (#27162)
• Simplify script metadata query (#27121)

Core type checking

• Decorate only overload implementation signatures (#27147)
• Don't consider known-instance types, generic aliases or non-singleton special-form types to be single-valued (#27137)
• Improve identity comparison inference for singleton types (#27126)
• Improve tuple membership and rich comparison inference (#27164)
• Model walrus bindings from comprehensions (#26466)
• Narrow tagged unions using identity comparisons (#27130)
• Preserve Self in __new__ calls (#27003)
• Preserve receiver constraints when binding overloaded methods (#27038)
• Support generic manual PEP 695 type aliases (#27083)
• Treat bivariance as covariant (#24319)

Performance

• Avoid cycles when resolving ModuleType globals (#27182)
• Avoid expanding optional enum comparisons (#27105)
• Avoid repeated inference when copying mixed TypedDict unions (#27108)
• Improve importer performance (#27159)
• Improve union and intersection builder performance (#27167)

Contributors

• @perfloop-agent
• @carljm
• @lerebear
• @Gankra
• @TrapsterDK
• @MichaReiser
• @thejchap
• @mtshiba
• @denyszhak
• @charliermarsh
• @AlexWaygood

Install ty 0.0.64

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.64/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.64/ty-installer.ps1 | iex"

Download ty 0.0.64

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>