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exponential runtime for some large unions (part 2)

genericsBugs or features relating to ty's generics implementationBugs or features relating to ty's generics implementation

performancePotential performance improvementPotential performance improvement

Status: Open.

#2123 In astral-sh/ty;

· markjm opened on Dec 19, 2025

ty hangs on combination of self-ref Union, dataclass and Protocol

hang

Status: Open.

#1998 In astral-sh/ty;

· sinon opened on Dec 17, 2025

Large enum takes very long to type check.

enums

performancePotential performance improvementPotential performance improvement

Status: Open.

#1588 In astral-sh/ty;

· MichaReiser opened on Nov 19, 2025

Auto Import: Add support for namespace packages

completionsBugs or features relating to autocomplete suggestionsBugs or features relating to autocomplete suggestions

importsModule resolution, site-packages discovery, import-related diagnosticsModule resolution, site-packages discovery, import-related diagnostics

serverRelated to the LSP serverRelated to the LSP server

Status: Open.

Feature

#2273 In astral-sh/ty;

· Zhmjharmgal opened on Dec 30, 2025

Autocomplete prioritizes nested classes over properties

completionsBugs or features relating to autocomplete suggestionsBugs or features relating to autocomplete suggestions

serverRelated to the LSP serverRelated to the LSP server

Status: Open.

#2029 In astral-sh/ty;

· steved-stripe opened on Dec 17, 2025

Non deterministic diagnostics

bugSomething isn't workingSomething isn't working

Status: Open.

Bug

#1670 In astral-sh/ty;

· MichaReiser opened on Nov 28, 2025

On-hover for call arguments

serverRelated to the LSP serverRelated to the LSP server

Status: Open.

#1350 In astral-sh/ty;

· MichaReiser opened on Oct 14, 2025

[panic] Interaction between the __call__ method, decoraters, callable annotations, and self referential return types on 3.14

fatala fatal error (panic or crash)a fatal error (panic or crash)

great-writeupA wonderful example of a quality contributionA wonderful example of a quality contribution

Status: Open.

#2324 In astral-sh/ty;

· eliasbenb opened on Jan 5, 2026

Hang/OOM on generic function wrapping a method with many overloads

fatala fatal error (panic or crash)a fatal error (panic or crash)

overloads

performancePotential performance improvementPotential performance improvement

Status: Open.

#2400 In astral-sh/ty;

· jelle-openai opened on Jan 8, 2026

Overloads don't work on decorated functions

overloads

Status: Open.

Bug

#2278 In astral-sh/ty;

· ncollins-vs opened on Dec 30, 2025

find-references: Honor includeDeclaration

bugSomething isn't workingSomething isn't working

serverRelated to the LSP serverRelated to the LSP server

Status: Open.

#1950 In astral-sh/ty;

· Gankra opened on Dec 16, 2025

Method call on constrained typevar emits invalid-argument-type

attribute accessInstance attributes, class attributes, etc.Instance attributes, class attributes, etc.

bugSomething isn't workingSomething isn't working

genericsBugs or features relating to ty's generics implementationBugs or features relating to ty's generics implementation

Status: Open.

#1503 In astral-sh/ty;

· sharkdp opened on Nov 8, 2025

Top[] and Bottom[] should respect upper bounds and constraints

bugSomething isn't workingSomething isn't working

Status: Open.

#1109 In astral-sh/ty;

· InSyncWithFoo opened on Aug 31, 2025

Support functools.partial

Status: Open.

Feature

#1536 In astral-sh/ty;

· carljm opened on Nov 13, 2025

Old constraint solver always combines specializations using union

genericsBugs or features relating to ty's generics implementationBugs or features relating to ty's generics implementation

Status: Open.

#2799 In astral-sh/ty;

· dcreager opened on Feb 12, 2026

overly broad typevar matching against a union parameter with multiple typevar occurrences

genericsBugs or features relating to ty's generics implementationBugs or features relating to ty's generics implementation

Status: Open.

#2870 In astral-sh/ty;

· marovira opened on Feb 20, 2026

Non-deterministic overload matching failure

bugSomething isn't workingSomething isn't working

Status: Open.

#1389 In astral-sh/ty;

· mtshiba opened on Oct 17, 2025

Relative import resolution

bugSomething isn't workingSomething isn't working

importsModule resolution, site-packages discovery, import-related diagnosticsModule resolution, site-packages discovery, import-related diagnostics

serverRelated to the LSP serverRelated to the LSP server

Status: Open.

#2907 In astral-sh/ty;

· rivershah opened on Feb 24, 2026

Editor: Cannot resolve imported module

importsModule resolution, site-packages discovery, import-related diagnosticsModule resolution, site-packages discovery, import-related diagnostics

questionAsking for support or clarificationAsking for support or clarification

serverRelated to the LSP serverRelated to the LSP server

Status: Open.

#3021 In astral-sh/ty;

· murolem opened on Mar 12, 2026

Assigning Any & Top[list[Unknown]] to Iterable[T] wrongly solves T to object

genericsBugs or features relating to ty's generics implementationBugs or features relating to ty's generics implementation

Status: Open.

#3259 In astral-sh/ty;

· carljm opened on Apr 12, 2026