Issues

• Support annotated Polars lazy frames

  dataframe
  facebook/pyrefly#5271 · Filter by author T0rvadaL opened on Oct 18, 2026

• [torch-stubs] torch.maximum accepts a scalar argument in 1.4.0

  facebook/pyrefly#5270 · Filter by author Darlokt opened on Oct 18, 2026

• [1.4 regression] Nested optional-generic call causes a false constructor type error

  facebook/pyrefly#5269 · Filter by author Darlokt opened on Oct 18, 2026

• [tensor-shapes] einsum rejects singleton broadcasting between operands

  pytorchtensor-shapes
  facebook/pyrefly#5268 · Filter by author Darlokt opened on Oct 18, 2026

• [torch-stubs] Valid complex-scalar operations are rejected

  facebook/pyrefly#5267 · Filter by author Darlokt opened on Oct 18, 2026

• [torch-stubs] Missing public Torch attributes after upgrading to 1.4.0

  facebook/pyrefly#5266 · Filter by author Darlokt opened on Oct 18, 2026

• TypeVar defaults of a constructor-call argument are not used to solve the outer class's type variables

  django
  facebook/pyrefly#5265 · Filter by author UnknownPlatypus opened on Oct 18, 2026

• TypeGuard/TypeIs narrowing not applied when the argument is passed by keyword

  narrowingtypechecking
  facebook/pyrefly#5263 · Filter by author ricardomart opened on Oct 18, 2026

• Conditional attribute reassignment loses the assigned type

  facebook/pyrefly#5259 · Filter by author rexledesma opened on Oct 17, 2026

• Subscripting a bounded or constrained TypeVar resolves Self in __getitem__ to the bound instead of the TypeVar

  typechecking
  Bug

  facebook/pyrefly#5257 · Filter by author kinto0 opened on Oct 17, 2026
  

• Hover message should show doc string for class when __init__ has none

  good first issuelanguage-server
  Feature

  facebook/pyrefly#5254 · Filter by author jaens opened on Oct 16, 2026
  2

• infer adds a runtime import of a stub-only name (unittest.mock._patch_pass_arg), breaking the module

  facebook/pyrefly#5253 · Filter by author mollydoo opened on Oct 16, 2026

• Type information lost during PEP798-style unpacking in comprehensions

  facebook/pyrefly#5251 · Filter by author JeppeKlitgaard opened on Oct 16, 2026

• --report-glean names a method on a Literal or LiteralString receiver without its class (title, not str.title)

  facebook/pyrefly#5250 · Filter by author mollydoo opened on Oct 16, 2026

• bad-override false positive on pandera's nested class Config

  dataframedjangotypechecking
  facebook/pyrefly#5248 · Filter by author sk- opened on Oct 15, 2026

• Pyrefly's synthesized Pydantic RootModel constructor ignores model-level strict=True

  pydantic
  facebook/pyrefly#5242 · Filter by author danielpassy-maistodos opened on Oct 15, 2026

• Pyrefly and Pyright treat conformance for overload matching differently.

  facebook/pyrefly#5239 · Filter by author rchiodo opened on Oct 14, 2026
  4

• False-positive bad-specialization for a legacy TypeVar bound to a generic Protocol, in a constructor call with a contextual type

  typechecking
  Bug

  facebook/pyrefly#5237 · Filter by author kinto0 opened on Oct 14, 2026
  

• Error: Argument (ParamSpec(Unknown)) -> Unknown is not assignable to parameter func with type (...) -> Any in function inspect.unwrap

  facebook/pyrefly#5227 · Filter by author asukaminato0721 opened on Oct 14, 2026

• from .. import x fails in modules whose filename starts with a digit (e.g. Django migrations)

  django
  facebook/pyrefly#5223 · Filter by author connernilsen opened on Oct 13, 2026

• Names silently become Unknown when a package re-exports a cycle via from .x import *

  facebook/pyrefly#5222 · Filter by author connernilsen opened on Oct 13, 2026

• lst[cast("int", a)] += 1 gives bad-argument-type on the "int" input even though it's valid

  Bug

  facebook/pyrefly#5220 · Filter by author StefanBRas opened on Oct 13, 2026

• Hover on property with setter during assignment shows nothing

  language-server
  facebook/pyrefly#5218 · Filter by author StefanBRas opened on Oct 13, 2026
  3

• Confusing error message for bad-argument-type on methods where self is incorrect and there are overloads

  facebook/pyrefly#5217 · Filter by author StefanBRas opened on Oct 13, 2026

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

  facebook/pyrefly#5212 · Filter by author DetachHead opened on Oct 13, 2026
  2