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stubtest crashes with <code>TypeError</code> when runtime value is a proxy object that overrides <code>__class__</code>

crash

Status: Open.

#20919 In python/mypy;

· JaeHyuckSa opened on Feb 27, 2026

mypy is unable to narrow a union type that includes a <code>StrEnum</code> subclass and a <code>Literal</code>

bugmypy got something wrongmypy got something wrong

Status: Open.

#20915 In python/mypy;

· exg opened on Feb 27, 2026

IndexError when unpacking type

crash

topic-pep-695Issues related to PEP 695 syntaxIssues related to PEP 695 syntax

Status: Open.

#20913 In python/mypy;

· correctmost opened on Feb 27, 2026

Incorrect note references builtins.pyi instead of the class definition

bugmypy got something wrongmypy got something wrong

topic-error-reportingHow we report errorsHow we report errors

Status: Open.

#20911 In python/mypy;

· chriselion opened on Feb 26, 2026

Pattern matching a dataclass with different field type fails for Python &gt;= 3.13

bugmypy got something wrongmypy got something wrong

topic-dataclasses

topic-match-statementPython 3.10's match statementPython 3.10's match statement

Status: Open.

#20904 In python/mypy;

· mtsokol opened on Feb 26, 2026

Improve t-string support by checking formats, etc

feature

Status: Open.

#20903 In python/mypy;

· nascheme opened on Feb 25, 2026

Mypy degrades inferred generic return type from tuple[type[T], ...] to object

bugmypy got something wrongmypy got something wrong

topic-inferenceWhen to infer types or require explicit annotationsWhen to infer types or require explicit annotations

topic-join-v-unionUsing join vs. using unionsUsing join vs. using unions

Status: Open.

#20891 In python/mypy;

· Vanerio opened on Feb 24, 2026

Backslashes become forward slashes in literal types in tests

bugmypy got something wrongmypy got something wrong

topic-tests

Status: Open.

#20884 In python/mypy;

· wyattscarpenter opened on Feb 24, 2026

[dev] audit -skip tests

topic-developerIssues relevant to mypy developersIssues relevant to mypy developers

topic-tests

Status: Open.

#20881 In python/mypy;

· wyattscarpenter opened on Feb 24, 2026

Inconsistent feeling handling of Any in binder

bugmypy got something wrongmypy got something wrong

topic-type-narrowingConditional type narrowing / binderConditional type narrowing / binder

Status: Open.

#20870 In python/mypy;

· hauntsaninja opened on Feb 23, 2026

Type checking <code>struct.unpack</code>

feature

topic-pluginsThe plugin API and ideas for new pluginsThe plugin API and ideas for new plugins

Status: Open.

#20869 In python/mypy;

· sakgoyal opened on Feb 23, 2026

error: Expression is of type "Any", not "Any" (Using <code>Any</code> as a <code>type</code>)

bugmypy got something wrongmypy got something wrong

Status: Open.

#20859 In python/mypy;

· George-Ogden opened on Feb 22, 2026