ty 0.0.100

on Python PyPI

Release Notes

Released on 2026-11-09.

Breaking changes

• Distinguish attributes missing from some union members (#29944)
• Give abstract class instantiation its own diagnostic rule (#29948)
• Separate missing and inconsistent overload implementation diagnostics (#29953)
• Split invalid-key into three TypedDict diagnostic rules (#29955)
• Split out lost-keyword-for-regular-parameter from incompatible-method-override (#30143)

Bug fixes

• Fix partial application of ParamSpec decorators (#30150)
• Offer inlay hint edits only for valid annotation targets (#30208)
• Preserve distinct bytes keys during narrowing (#30207)

Diagnostic improvements

• Explain why a rule was removed in configuration and ignore comments (#30128)
• Rename incompatible override rules (#30142)

Memory usage improvements

• Avoid caching bundled stub source during parsing (#30181)
• Defer formatting details for suppressed diagnostics (#30169)

Other changes

• Avoid repeated scans when merging class MROs (#30095)
• Cache context-free specialized alias values (#30099)
• Cache raw signatures for overload declarations (#30106)
• Cache the previous declaration in an overload set (#30110)
• Check constraint equivalence by searching for counterexamples (#30093)
• Collect namespace members once per metaclass (#30165)
• Index lazy enclosing snapshots by symbol name (#30088)
• Reduce redundant work in structural recursive type inference (#29975)
• Reject incompatible fixed tuple contexts as elements are inferred (#30183)
• Reuse the incoming flow after boolean expressions without assignments (#30097)
• Skip repeated type constraints for collection literals (#30089)
• Skip union checks for incomparable types (#30102)

Contributors

• @mtshiba
• @charliermarsh
• @AlexWaygood
• @MichaReiser
• @sharkdp
• @carljm

Install ty 0.0.100

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ty/releases/download/0.0.100/ty-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ty/releases/download/0.0.100/ty-installer.ps1 | iex"

Download ty 0.0.100

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>