20 Pull requests merged by 10 people

• [mypyc] feat: exact_dict_set_item_op

  #19657 merged Aug 14, 2025

• chore: homogenize TypeGuard usage in rtypes.py

  #19655 merged Aug 14, 2025

• [mypyc] feat: cache len for iterating over immutable types

  #19656 merged Aug 14, 2025

• [mypyc] feat: stararg fastpath when calling fn(*args) with tuple

  #19623 merged Aug 13, 2025

• [mypyc] Include more operations in the trace log

  #19647 merged Aug 13, 2025

• [mypyc] Fix remaining failing test on free-threaded builds

  #19646 merged Aug 13, 2025

• Special-case enum method calls

  #19634 merged Aug 12, 2025

• Another two micro-optimizations

  #19633 merged Aug 11, 2025

• [mypyc] Add prefix to attributes of generator classes

  #19535 merged Aug 11, 2025

• PEP 702 (@deprecated): handle "combined" overloads

  #19626 merged Aug 10, 2025

• [mypyc] Fix seg fault due to heap type objects with static tp_doc

  #19636 merged Aug 10, 2025

• Two more micro-optimizations

  #19627 merged Aug 9, 2025

• Cache common instances

  #19621 merged Aug 9, 2025

• Further fix overload diagnostic for vararg and varkwarg

  #19619 merged Aug 9, 2025

• [mypyc] Provide instructions for resolving missing test module on Windows

  #19579 merged Aug 9, 2025

• Fix crash on settable property alias

  #19615 merged Aug 8, 2025

• PEP 702 (@deprecated): consider overloads in snapshot descriptions

  #19613 merged Aug 8, 2025

• Fix overload diagnostic when vararg and varkwarg can match

  #19614 merged Aug 8, 2025

• Fix TypeGuard with call on temporary object

  #19577 merged Aug 8, 2025

• Fix #19491, crash when using enable_error_code value of wrong type in pyproject.toml

  #19494 merged Aug 8, 2025

18 Pull requests opened by 8 people

• feat: proper narrowing for TypedDict keys and values

  #19610 opened Aug 7, 2025

• [mypyc] feat: optimize f-string building from Final values

  #19611 opened Aug 7, 2025

• Make IntEnum/StrEnum values passable to functions expecting literal ints or strs

  #19617 opened Aug 8, 2025

• [mypyc] feat: extend stararg fastpath from #19623 to handle lists and generic sequences

  #19629 opened Aug 9, 2025

• [mypyc] feat: extend stararg fastpath from #19629 with star2 fastpath

  #19630 opened Aug 9, 2025

• [mypyc] feat: PyObject_CallObject op for fn(*args) fastpath

  #19631 opened Aug 9, 2025

• Fix `--strict-equality` for iteratively visited code

  #19635 opened Aug 10, 2025

• Remove the Anys from mypy/config_parser.py

  #19637 opened Aug 10, 2025

• [refactor] increase consistency in stdout and stderr optional arguments

  #19638 opened Aug 10, 2025

• Special case TypedDict.get

  #19639 opened Aug 11, 2025

• Reset to previous statement when leaving `return` in semanal

  #19642 opened Aug 11, 2025

• [mypyc] feat: ForFilter generator helper for `builtins.filter`

  #19643 opened Aug 12, 2025

• Include `ambiguous` into `UninhabitedType` identity

  #19648 opened Aug 12, 2025

• [mypyc] feat: ForMap generator helper for `builtins.map`

  #19649 opened Aug 12, 2025

• Fix inference when unpacking union type

  #19650 opened Aug 12, 2025

• Rework starargs with union argument

  #19651 opened Aug 13, 2025

• Always try to report missing protocol members

  #19653 opened Aug 13, 2025

• [mypyc] feat: `__mypyc_empty_tuple__` constant

  #19654 opened Aug 14, 2025

8 Issues closed by 3 people

• Mypy configuration is incomplete

  #19429 closed Aug 9, 2025

• `__new__` return types are not respected (reported as error and overwritten by the current class) unless the return type is a subclass of the current class

  #19624 closed Aug 9, 2025

• MyPy does not recognize methods as `MethodType`, only as `Callable`

  #19620 closed Aug 9, 2025

• Mypy crash on master with property alias with setters

  #19572 closed Aug 8, 2025

• False positive on overload implementation does not accept all possible arguments with varargs

  #19612 closed Aug 8, 2025

• Incorrect handling of overloads with `defaultdict` and `MutableMapping`

  #19525 closed Aug 8, 2025

• TypeGuard/TypeIs broken on __call__ with fresh class

  #19575 closed Aug 8, 2025

• Crash when using an invalid 'enable_error_code' value in pyproject.toml

  #19491 closed Aug 8, 2025

12 Issues opened by 8 people

• Cannot instantiate type "Type[None]"

  #19660 opened Aug 14, 2025

• Maybe fails to solve `tuple[int, *Ts, int]` as an `Iterable[T]`.

  #19659 opened Aug 14, 2025

• `NamedTuple` parametrized with a `ParamSpec` can't be used as an annotation

  #19658 opened Aug 14, 2025

• Unclear when Join is picked vs Union in upcast operation.

  #19652 opened Aug 13, 2025

• mypy daemon consumes an increasing amount of memory every time `run` or `recheck` is invoked

  #19644 opened Aug 12, 2025

• Mypy thinks `dict[Never, Never]` is a subtype of `Mapping[str, object]`

  #19641 opened Aug 11, 2025

• Type alias and union wrong revealed type

  #19640 opened Aug 11, 2025

• `name-defined` is whitespace-dependent

  #19632 opened Aug 9, 2025

• Specify behavior for `Literal?` types.

  #19625 opened Aug 9, 2025

• Severe performance degradation with lots of constrained type variables in a generic class

  #19622 opened Aug 9, 2025

• unexpected "var-annotated" when using constrained TypeVar

  #19618 opened Aug 8, 2025

• MyIntEnum.ONE should be passable to functions expecting Literal[1] arguments

  #19616 opened Aug 8, 2025

26 Unresolved conversations

Sometimes conversations happen on old items that aren’t yet closed. Here is a list of all the Issues and Pull Requests with unresolved conversations.

• [mypyc] feat: true_dict_rprimitive for optimized dict fastpath usage

  #19499 commented on Aug 14, 2025 • 7 new comments

• Fix `meet_types` for literal and instance

  #19605 commented on Aug 11, 2025 • 0 new comments

• Better support for `SomeEnum.item == some_literal`

  #19594 commented on Aug 8, 2025 • 0 new comments

• [stubtest] Check runtime availability of private types not marked `@type_check_only`

  #19574 commented on Aug 8, 2025 • 0 new comments

• refactor `visit_conditional_expr` to fix ternary behavior (option 1)

  #19563 commented on Aug 12, 2025 • 0 new comments

• [match-case] Fix narrowing of class pattern with union-argument.

  #19517 commented on Aug 12, 2025 • 0 new comments

• feat(test): mypyc tests for container creation from `range`

  #19511 commented on Aug 14, 2025 • 0 new comments

• [mypyc] feat: cache len for iterating over immutable types and expressions with length known at compile time

  #19503 commented on Aug 14, 2025 • 0 new comments

• feat: `__repr__` method for RefExpr and NameExpr

  #19486 commented on Aug 13, 2025 • 0 new comments

• Apply union expansion when checking ops involving typevars

  #19455 commented on Aug 8, 2025 • 0 new comments

• Try to fix problems caused by in-place modification of typevar defaults

  #19382 commented on Aug 8, 2025 • 0 new comments

• Do not display import-related errors after module-level always false assert

  #19347 commented on Aug 8, 2025 • 0 new comments

• feat: new mypyc primitives for weakref.proxy

  #19217 commented on Aug 14, 2025 • 0 new comments

• WIP: new mypyc primitive for `weakref.ref.__call__`

  #19145 commented on Aug 14, 2025 • 0 new comments

• feat(mypyc): proper weakref support

  #19056 commented on Aug 7, 2025 • 0 new comments

• Allow any type to be returned by `__new__`

  #14471 commented on Aug 9, 2025 • 0 new comments

• Unable to specify a default value for a generic parameter

  #3737 commented on Aug 13, 2025 • 0 new comments

• Type narrowing for a tuple is worse with match than with the equivalent isinstance check

  #19082 commented on Aug 13, 2025 • 0 new comments

• Type narrowing for dict.get("key") is not None

  #14766 commented on Aug 11, 2025 • 0 new comments

• Support a method of copying function signature

  #10574 commented on Aug 10, 2025 • 0 new comments

• Announcement issue for plugin API changes

  #6617 commented on Aug 9, 2025 • 0 new comments

• `meet_types` gives unexpected results when meeting literal and Instance

  #19560 commented on Aug 9, 2025 • 0 new comments

• Internal error: De-serialization failure: `TypeInfo` not fixed

  #18087 commented on Aug 8, 2025 • 0 new comments

• segfault on recursive generic function class

  #18219 commented on Aug 8, 2025 • 0 new comments

• For tuple in match, _ isn't determined to be Never, but _, _ is

  #18792 commented on Aug 8, 2025 • 0 new comments

• TypeGuard behavior does not match python semantics in async functions

  #19608 commented on Aug 7, 2025 • 0 new comments