Issues

• overloads with override decorator has false positives in stubs

  astral-sh/ty#4742 · Filter by author OutSquareCapital opened on Oct 16, 2026

• Return type inference: your feedback

  help wantedtype-inference
  astral-sh/ty#4739 · Filter by author sharkdp opened on Oct 16, 2026
  1

• Stack overflow on suspected attribute name collision

  bugfatal
  astral-sh/ty#4738 · Filter by author mbertheau opened on Oct 16, 2026 · Stable

• PEP 661 sentinel annotated Final is rejected as a type

  bugtyping semantics
  astral-sh/ty#4737 · Filter by author gaborbernat opened on Oct 15, 2026
  2

• [0.0.88 regression] False positive with complicated generics and self types

  bidirectional inferencebuggenericsregression
  astral-sh/ty#4736 · Filter by author jelle-openai opened on Oct 15, 2026
  1

• Default argument checked as a type expression when the value type is a TypeForm

  bidirectional inferencebugcalls
  astral-sh/ty#4735 · Filter by author gaborbernat opened on Oct 15, 2026

• property inferred for accessing property on type[Base], but subclasses can override to non-property

  descriptorsoverrides
  astral-sh/ty#4734 · Filter by author Zalk0 opened on Oct 15, 2026
  2

• Add Pyright-compatible strictListInference and strictDictionaryInference options

  gradual-guaranteeneeds-decisiontype-inference
  astral-sh/ty#4731 · Filter by author zhouzaida opened on Oct 15, 2026
  3

• Add FAQ on dealing with conditional imports

  control flowdocumentation
  astral-sh/ty#4730 · Filter by author jepler opened on Oct 15, 2026
  5

• Legacy type aliases crash where new ones don't on recursive alias not expansion

  bugcyclesfataltype aliases
  astral-sh/ty#4728 · Filter by author MeGaGiGaGon opened on Oct 15, 2026
  

• isinstance() with a NumPy scalar type like np.int64 doesn't narrow

  genericslibrarynarrowingneeds-decision
  astral-sh/ty#4727 · Filter by author pylaterreur opened on Oct 14, 2026
  6

  

• don't privilege un-annotated class-body assignments over method

  attributes
  astral-sh/ty#4717 · Filter by author carljm opened on Oct 13, 2026
  1

• Allow tighter types with protocols and overloads

  constraint-solverfeaturegenerics
  astral-sh/ty#4716 · Filter by author A5rocks opened on Oct 13, 2026
  2

• Class-level alias of a self-type-overloaded method resolves to the wrong overload

  bugmethod-receiveroverloadsunsoundness
  astral-sh/ty#4715 · Filter by author dgavrilov opened on Oct 13, 2026

• @deprecated is not propagated through decorators that return a callable instance

  bugcallablesdiagnostics
  astral-sh/ty#4713 · Filter by author Jeremiah-England opened on Oct 13, 2026
  1

• Solve collection literal type context through constraint solver

  bidirectional inferenceconstraint-solvergenerics
  astral-sh/ty#4712 · Filter by author ibraheemdev opened on Oct 13, 2026 · Stable
  

• Nested class override rejected even when it subclasses the inherited class

  attributesbugoverrides
  astral-sh/ty#4711 · Filter by author carljm opened on Oct 13, 2026 · Stable
  5

• new rule - overload signatures not immediately followed by the implementation

  lint
  astral-sh/ty#4709 · Filter by author DetachHead opened on Oct 13, 2026

• Completions: suggest Literal values for dict-literal values

  completionsserver
  astral-sh/ty#4705 · Filter by author karpetrosyan opened on Oct 10, 2026

• Performance regression: ty check ~1.9x slower wall-clock (≈1.4x CPU) from 0.0.82 to 0.0.83+ on a large monorepo

  performanceregression
  astral-sh/ty#4703 · Filter by author fredericmorin-flare opened on Oct 9, 2026 · Stable
  7

  

• Empty collection literals trigger unsound-assignment for abstract collection annotations

  bidirectional inference
  astral-sh/ty#4697 · Filter by author siraben opened on Oct 9, 2026
  1

• Preserve caller-fixed variable obligations during generic inference

  bugconstraint-solvergenericsneeds-designunsoundness
  astral-sh/ty#4696 · Filter by author carljm opened on Oct 8, 2026 · Stable
  1

  

• Regression in 0.0.85: bounded TypeVar rejects a valid non-generic union alternative

  bugconstraint-solvergenericsregression
  astral-sh/ty#4695 · Filter by author cmp0xff opened on Oct 8, 2026 · Stable
  1

  

• [tracking] Starlark

  astral-sh/ty#4724 · Filter by author zsol opened on Oct 8, 2026
  1

  

• Stack overflow on protocol nested intersection not self of typevar and Any twice

  fatalprotocols
  astral-sh/ty#4691 · Filter by author MeGaGiGaGon opened on Oct 7, 2026