ty 0.0.86 on Python PyPI

Release Notes

Released on 2026-10-09.

The executables in our macOS and Windows release archives and ty wheels are now code-signed. macOS executables are signed with an Apple Developer ID certificate and notarized by Apple. Windows executables have timestamped Authenticode signatures from Azure Artifact Signing. This enables verification of the release publisher and binary integrity, supports publisher-based allowlisting, and should reduce security warnings and antivirus false positives.

Bug fixes

Infer empty collection branches from nonempty literals (#29131)
Invalidate dependency metadata when environments change (#29126)
Preserve final attribute restrictions on composite types (#29135)
Preserve recursive structure in Annotated values (#29058)
Specialize inherited dataclass field converters (#29192)

LSP server

Show documentation for annotation operators on hover (#29185)

Core type checking

Check attribute and property override types (#28556)
Narrow tuple unions through truthiness and type checks (#29125)
Preserve literal types when consuming dictionary literals (#29145)
Preserve non-boolean comparison results for intersections (#28045)
Preserve receiver specializations when calling unions of bound methods (#29015)
Represent uninhabited truthiness explicitly (#28843)
Solve validity type context through constraint sets (#28909)

Performance

Avoid recursion guards for non-generic nominal targets (#29202)
Check exact exclusions before intersection positives (#29195)

Memory usage improvements

Share constraints in retained sequent maps (#28966)

Other changes

Update the default Python version to 3.15 (#28792)
Update to Unicode 17 (#21229, #28784)
Always show fixes in the CLI (#27810)

Contributors

Install ty 0.0.86

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.86/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.86/ty-installer.ps1 | iex"

Download ty 0.0.86

File	Platform	Checksum
ty-aarch64-apple-darwin.tar.gz	Apple Silicon macOS	checksum
ty-x86_64-apple-darwin.tar.gz	Intel macOS	checksum
ty-aarch64-pc-windows-msvc.zip	ARM64 Windows	checksum
ty-i686-pc-windows-msvc.zip	x86 Windows	checksum
ty-x86_64-pc-windows-msvc.zip	x64 Windows	checksum
ty-aarch64-unknown-linux-gnu.tar.gz	ARM64 Linux	checksum
ty-i686-unknown-linux-gnu.tar.gz	x86 Linux	checksum
ty-powerpc64le-unknown-linux-gnu.tar.gz	PPC64LE Linux	checksum
ty-riscv64gc-unknown-linux-gnu.tar.gz	RISCV Linux	checksum
ty-s390x-unknown-linux-gnu.tar.gz	S390x Linux	checksum
ty-x86_64-unknown-linux-gnu.tar.gz	x64 Linux	checksum
ty-armv7-unknown-linux-gnueabihf.tar.gz	ARMv7 Linux	checksum
ty-aarch64-unknown-linux-musl.tar.gz	ARM64 MUSL Linux	checksum
ty-i686-unknown-linux-musl.tar.gz	x86 MUSL Linux	checksum
ty-x86_64-unknown-linux-musl.tar.gz	x64 MUSL Linux	checksum
ty-arm-unknown-linux-musleabihf.tar.gz	ARMv6 MUSL Linux (Hardfloat)	checksum
ty-armv7-unknown-linux-musleabihf.tar.gz	ARMv7 MUSL Linux	checksum

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>