astral-sh/ty 0.0.80

on GitHub

Release Notes

Released on 2026-09-09.

Bug fixes

• Fix --force-exclude for directories with an excluded ancestor (#28451)
• Preserve metaclass candidates after conflicts (#28461)

LSP server

• Give existing autofixes descriptive titles (#28456)
• Prevent LSP hangs during inlay hint bursts (#28390)

Diagnostic improvements

• Preserve redundant-condition diagnostics with unreachable operands (#28374)

Core type checking

• Check captured receivers when calling wrapped classmethods (#28467)
• Fix cached classmethods on generic classes (#28207)
• Fix disjointness of type guards and boolean literals (#28363)
• Infer tuple variance from the full tuple spec (#28446)
• Infer tuple variance more precisely (#28426)
• Preserve callable identity across specialized types (#28409)
• Preserve callback type context through ParamSpec forwarding (#28439)
• Preserve wrapped functions in precise functools.partial relations (#28460)
• Respect descriptor protocol for __set__ itself (#28408)
• Respect type-variable bounds in argument context (#28448)
• Unwrap union alternatives in overload implementations (#28468)

Performance

• Distribute len inference over unions (#28470)
• Fast-path concrete literal intersections (#28348)

Memory usage improvements

• Avoid excess capacity in multi-binding tables (#28412)
• Share equivalent place tables within a file (#28319)
• Share names in synthesized constructor parameters (#28398)

Contributors

• @sharkdp
• @charliermarsh
• @ibraheemdev
• @AlexWaygood
• @MichaReiser

Install ty 0.0.80

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.80/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.80/ty-installer.ps1 | iex"

Download ty 0.0.80

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>