astral-sh/ty 0.0.81

on GitHub

Release Notes

Released on 2026-09-14.

Bug fixes

• Escape glob characters in anchored directory paths (#28518)
• Ignore divergent markers when detecting descriptors (#28514)

CLI

• Anchor default exclude patterns at the project root (#28463)

Core type checking

• Avoid rebinding extracted method calls (#28469)
• Default-specialize class objects in meta-protocol checks (#28265)
• Fix MRO ordering for generic bases (#28172)
• Fix assignability of bounded typevars to intersection types (#28479)
• Fix variadic partial signature reduction (#28586)
• Handle gradual metaclass ancestry and conflicts (#28474)
• Preserve recursive metadata in union transformations (#28497)
• Preserve runtime comparison semantics when narrowing tagged unions (#28053)
• Preserve wrapped signatures in nominal descriptor checks (#28466)
• Reject reassignment of enum members (#28462)
• Report override conflicts introduced by new bases (#28530)
• Resolve dependencies within correlated inference alternatives (#28252)
• Respect instance dictionary storage for slotted classes (#27749)
• Validate explicitly overridden constructor signatures (#28115)

Performance

• Avoid redundant superclass member inference (#28587)
• Reuse rendered union elements when displaying types (#28494)

Memory usage improvements

• Reduce retained AST memory by shrinking expressions (#28335)
• Share strings in dependency metadata (#28141)

Contributors

• @sharkdp
• @ibraheemdev
• @MichaReiser
• @zsol
• @zanieb
• @charliermarsh
• @mtshiba
• @carljm

Install ty 0.0.81

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.81/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.81/ty-installer.ps1 | iex"

Download ty 0.0.81

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>