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language-serverIssues specific to our IDE integration rather than type checkingIssues specific to our IDE integration rather than type checking

Status: Open.

#3560 In facebook/pyrefly;

· asukaminato0721 opened on May 23, 2026

bad-argument-type false positive for multiple venvs in one check

configuration

typechecking

Status: Open.

#3556 In facebook/pyrefly;

· thoward27 opened on May 22, 2026

short circuit based on sys.version_info in bool op

quansight

typechecking

Status: Open.

Feature

#3554 In facebook/pyrefly;

· MarcoGorelli opened on May 22, 2026

Pyrefly reports missing-import for workspace package exposed via .pth editable install

language-serverIssues specific to our IDE integration rather than type checkingIssues specific to our IDE integration rather than type checking

Status: Open.

#3553 In facebook/pyrefly;

· DebanKsahu opened on May 22, 2026

@dataclass_transform metaclass + __new__ -> "Base" collapses subclasses to base

typechecking

Status: Open.

#3552 In facebook/pyrefly;

· jurasic-pf opened on May 22, 2026

bad-return after type(x) is C / isinstance(x, C) narrowing on a TypeVar

typechecking

Status: Open.

#3550 In facebook/pyrefly;

· jurasic-pf opened on May 22, 2026

0.64 regression: false positive bad-specialization in scipy-stubs

quansight

typechecking

Status: Open.

Bug

#3548 In facebook/pyrefly;

· jorenham opened on May 22, 2026

Unification loss when wrapping generic callback with functools.partial yields GenericResidual@_T

googleissues from googleissues from google

typechecking

Status: Open.

#3546 In facebook/pyrefly;

· QEDady opened on May 22, 2026

pydantic - protected attributes are incorrectly treated as fields

pydanticIssues related to support for PydanticIssues related to support for Pydantic

Status: Open.

Bug

#3544 In facebook/pyrefly;

· DetachHead opened on May 22, 2026

pydantic - Strict types are not treated as strict mode

help wantedLarger than "good first issue", but still well-defined and ready for someone to pick upLarger than "good first issue", but still well-defined and ready for someone to pick up

pydanticIssues related to support for PydanticIssues related to support for Pydantic

Status: Open.

Feature

#3543 In facebook/pyrefly;

· DetachHead opened on May 22, 2026

support underscore variables starting with (_) to indicate intentionally unused variables

help wantedLarger than "good first issue", but still well-defined and ready for someone to pick upLarger than "good first issue", but still well-defined and ready for someone to pick up

language-serverIssues specific to our IDE integration rather than type checkingIssues specific to our IDE integration rather than type checking

typechecking

Status: Open.

Feature

#3542 In facebook/pyrefly;

· DetachHead opened on May 22, 2026

infer-with-first-use doesn't work if variable is read before its first use

typechecking

Status: Open.

#3541 In facebook/pyrefly;

· DetachHead opened on May 22, 2026