Issues

• Pyrefly says explicit Any type parameters can be subclassed but not **kwargs entries with explicit Any type

  facebook/pyrefly#5422 · Filter by author willy-b opened on Oct 28, 2026

• errors config docs don't make sense

  facebook/pyrefly#5418 · Filter by author KotlinIsland opened on Oct 27, 2026

• TypeVars on 'self' on an instance method are not bound to the instance type.

  facebook/pyrefly#5416 · Filter by author TheDreadedAndy opened on Oct 27, 2026

• Pyrefly loses Any/Unknown when calling abs

  google
  facebook/pyrefly#5413 · Filter by author superbobry opened on Oct 27, 2026

• Pydantic constructor arguments are not type-checked through cls: type[Self]

  pydantic
  facebook/pyrefly#5410 · Filter by author acampove opened on Oct 27, 2026
  1

• bad-return when a NoReturn call is in a finally block

  facebook/pyrefly#5409 · Filter by author allenap opened on Oct 27, 2026

• Missing TypedDict required keys aren't reported when a dict literal uses ** unpacking

  good first issuetypechecking
  Bug

  facebook/pyrefly#5405 · Filter by author rchen152 opened on Oct 26, 2026
  2

  

• Enum value lookup accepts incompatible argument types without a diagnostic

  facebook/pyrefly#5398 · Filter by author Ravencentric opened on Oct 26, 2026
  2

  

• Possible bug, without preset basic, Pyrefly says explicit Any type parameters can be subclassed but not *args entries with explicit Any type

  facebook/pyrefly#5397 · Filter by author willy-b opened on Oct 26, 2026
  2

• Lambda parameter becomes Unknown after an or when the lambda is passed to an overloaded function (sorted / list.sort key)

  typechecking
  facebook/pyrefly#5396 · Filter by author t-miller opened on Oct 26, 2026
  

• Inherit base method docstrings in hover when an override has no docstring

  language-server
  facebook/pyrefly#5395 · Filter by author matuusu opened on Oct 26, 2026

• Duplicate hover tooltip in VS Code with extension 1.4.0 when venv has an older binary (works properly with previous 1.3.2 extension)

  language-server
  facebook/pyrefly#5393 · Filter by author Yasounet opened on Oct 26, 2026

• Redefinition of instance variable.

  facebook/pyrefly#5387 · Filter by author mayermart opened on Oct 26, 2026
  2

  

• Memory consumption in Pylance integration

  facebook/pyrefly#5385 · Filter by author yangdanny97 opened on Oct 26, 2026

• Inferred return types are truncated at nesting depth 3 (innermost replaced by Unknown)

  facebook/pyrefly#5377 · Filter by author serge-vk opened on Oct 26, 2026
  1

• [tensor-shapes] NumPy mean and sum declare rank-zero ndarrays for scalar results

  tensor-shapes
  facebook/pyrefly#5358 · Filter by author asukaminato0721 opened on Oct 24, 2026

• * is not supported between ndarray[[int], dtype[float32]] and Series[float] [unsupported-operation]

  tensor-shapes
  facebook/pyrefly#5356 · Filter by author asukaminato0721 opened on Oct 24, 2026

• No matching overload found for function pandas.core.frame._iLocIndexerFrame.__getitem__ called with arguments: (ndarray)

  dataframetensor-shapes
  facebook/pyrefly#5352 · Filter by author asukaminato0721 opened on Oct 24, 2026
  2

• Argument float64 is not assignable to parameter x with type Buffer | SupportsFloat | SupportsIndex | str in function float.__new__

  facebook/pyrefly#5350 · Filter by author asukaminato0721 opened on Oct 24, 2026

• xs += [...] doesn't use the declared type of xs as context for the right-hand side (but extend does?)

  quansight
  facebook/pyrefly#5345 · Filter by author MarcoGorelli opened on Oct 23, 2026
  

• Slot narrowing for custom container types

  narrowingtypechecking
  Bug

  facebook/pyrefly#5342 · Filter by author mfish33 opened on Oct 23, 2026
  1

  

• tuple sub-pattern not narrowed after a failed match case

  narrowingquansighttypechecking
  facebook/pyrefly#5340 · Filter by author MarcoGorelli opened on Oct 23, 2026
  1

  

• Narrowing on a missing attribute narrows it to object instead of Unknown, causing cascading errors

  googlenarrowingneeds-discussiontypechecking
  facebook/pyrefly#5333 · Filter by author QEDady opened on Oct 22, 2026
  1

• Pyrefly leaks generic converter implementation types into attrs __init__ despite an Any overload

  attrs
  facebook/pyrefly#5331 · Filter by author AdrianSosic opened on Oct 22, 2026

• Hover/SignatureHelp formatting is unreadable for long signatures(pandas.read_csv) due to column alignment and single-line label

  dataframelanguage-servernotebook
  facebook/pyrefly#5328 · Filter by author Hi-MyWorld opened on Oct 22, 2026