ty 0.0.63

on Python PyPI

Release Notes

Released on 2026-07-23.

Core type checking

• Handle generic stringified PEP 613 (typing.TypeAlias) type aliases (#27092)
• Allow equality narrowing across non-final classes (#27031)
• Allow interpolated string literals to be promoted to str (#27104)
• Fix double specialization of generic type aliases (#27058)
• Fix intersections of type and TypeForm (#27099)
• When narrowing from a match statement leads a variable x to be inferred as A & B, infer the type of x.attr as <type of A.attr> & <type of B.attr> (#27103)

Library support

• Pydantic: Stricter validation of sub-model fields in lax mode (#27091)
• Pydantic: Support special underscore parameters in BaseSettings models (#27098)

Performance

• Avoid exponential narrowing of optional dynamic match subjects (#27100)
• Avoid normalizing cached absolute file paths (#26998)

Contributors

• @sharkdp
• @charliermarsh
• @ibraheemdev
• @carljm

Install ty 0.0.63

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.63/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.63/ty-installer.ps1 | iex"

Download ty 0.0.63

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>