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#2125 · carljm opened on Dec 20, 2025
Return type inference: your feedback
#4739 · sharkdp opened on Oct 16, 2026
15
Type system feature overview
#1889 · sharkdp opened on Dec 15, 2025

deprecated not reported when attribute access resolves to a deprecated __get__ overload
astral-sh/ty#4817 · opened on Oct 24, 2026
Different assignment diagnostics in warm and cold LSP sessions after creating an open .pyi
astral-sh/ty#4816 · opened on Oct 24, 2026
'|' (Union) and match performance issues
astral-sh/ty#4815 · opened on Oct 24, 2026
Per-key dictionary narrowing is not retained when assigning a subscript expression to a variable
astral-sh/ty#4814 · opened on Oct 23, 2026
Subscripting a dictionary explicitly annotated as dict[str, Any] can evaluate to a non-Any type
astral-sh/ty#4813 · opened on Oct 23, 2026
Decorated functions lose their semantic token in import statements
astral-sh/ty#4811 · opened on Oct 23, 2026
Regression in generic callable inference when passing sum
astral-sh/ty#4810 · opened on Oct 22, 2026
2
Generic constructor inference discards earlier union-expanded argument cases
astral-sh/ty#4808 · opened on Oct 22, 2026
Regression in 0.0.90: ParamSpec forwarding with an invariant Any result context
astral-sh/ty#4804 · opened on Oct 22, 2026
1
Regression in 0.0.90 when inferring a generic TypedDict through a union parameter
astral-sh/ty#4803 · opened on Oct 22, 2026
1
Regression in 0.0.90 for a nested variadic callback
astral-sh/ty#4802 · opened on Oct 22, 2026
1
Hang involving recursive alias negation
astral-sh/ty#4799 · opened on Oct 22, 2026
Hang inferring recursive loop values through a union of generic containers
astral-sh/ty#4798 · opened on Oct 22, 2026
yt-dlp is slow to type check
astral-sh/ty#4793 · opened on Oct 22, 2026 · Stable
2
Langflow is slow to type check
astral-sh/ty#4792 · opened on Oct 22, 2026
Completions continue computing after client cancellation
astral-sh/ty#4791 · opened on Oct 22, 2026
3
Record nonlocal declarations for eager nested-scope snapshots
Bug
astral-sh/ty#4788 · opened on Oct 21, 2026
Report deferred reads of deleted enclosing names
Bug
astral-sh/ty#4787 · opened on Oct 21, 2026
Include builtin fallbacks when a global is conditionally defined
Bug
astral-sh/ty#4786 · opened on Oct 21, 2026
Warn about structural type with unused type variable
astral-sh/ty#4777 · opened on Oct 21, 2026
3
Synthesized __replace__ makes an InitVar without a default optional, but the runtime requires it
astral-sh/ty#4775 · opened on Oct 20, 2026
Fixing one @override error on a property triggers another
astral-sh/ty#4772 · opened on Oct 20, 2026
1
Attribute Liskov errors from multiple inheritance are not reported
astral-sh/ty#4771 · opened on Oct 20, 2026
1
Bare Final in dataclasses is mishandled
astral-sh/ty#4766 · opened on Oct 20, 2026
Declared ClassVar type from a base class is replaced by the type assigned to cls.<attr> in a subclass's __init_subclass__
astral-sh/ty#4762 · opened on Oct 20, 2026

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Issues

Issues

`deprecated` not reported when attribute access resolves to a deprecated `get` overload

Different assignment diagnostics in warm and cold LSP sessions after creating an open .pyi

'|' (Union) and match performance issues

Per-key dictionary narrowing is not retained when assigning a subscript expression to a variable

Subscripting a dictionary explicitly annotated as `dict[str, Any]` can evaluate to a non-`Any` type

Decorated functions lose their semantic token in import statements

Regression in generic callable inference when passing sum

Generic constructor inference discards earlier union-expanded argument cases

Regression in 0.0.90: ParamSpec forwarding with an invariant Any result context

Regression in 0.0.90 when inferring a generic TypedDict through a union parameter

Regression in 0.0.90 for a nested variadic callback

Hang involving recursive alias negation

Hang inferring recursive loop values through a union of generic containers

yt-dlp is slow to type check

Langflow is slow to type check

Completions continue computing after client cancellation

Record nonlocal declarations for eager nested-scope snapshots

Report deferred reads of deleted enclosing names

Include builtin fallbacks when a global is conditionally defined

Warn about structural type with unused type variable

Synthesized `replace` makes an `InitVar` without a default optional, but the runtime requires it

Fixing one `@override` error on a property triggers another

Attribute Liskov errors from multiple inheritance are not reported

Bare Final in dataclasses is mishandled

Declared `ClassVar` type from a base class is replaced by the type assigned to `cls.<attr>` in a subclass's `__init_subclass__`