18 Pull requests merged by 5 people

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

  #19629 merged Aug 18, 2025

• [mypyc] Add primitive for <type>.__name__

  #19683 merged Aug 18, 2025

• [mypyc] Speed up "in" against final fixed-length tuple

  #19682 merged Aug 18, 2025

• [mypyc] Refactor building IR for "in" against a tuple

  #19679 merged Aug 18, 2025

• Sync typeshed

  #19664 merged Aug 16, 2025

• Sort arguments in TypedDict overlap error message

  #19666 merged Aug 15, 2025

• [mypyc] Remove unreachable code

  #19667 merged Aug 15, 2025

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

  #19611 merged Aug 15, 2025

• fix: prevent false positive "untyped after decorator transformation" after deferral

  #19591 merged Aug 15, 2025

• Reset to previous statement when leaving return in semanal

  #19642 merged Aug 14, 2025

• Include ambiguous into UninhabitedType identity

  #19648 merged Aug 14, 2025

• [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

15 Pull requests opened by 7 people

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

  #19643 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

• More efficient (fixed-format) serialization

  #19668 opened Aug 15, 2025

• [mypyc] feat: new primitives for `bytes.rjust` and `bytes.ljust`

  #19672 opened Aug 16, 2025

• [mypyc] feat: new primitive for `int.bit_length`

  #19673 opened Aug 16, 2025

• [mypyc] feat: new primitive for `int.to_bytes`

  #19674 opened Aug 16, 2025

• [testing]

  #19676 opened Aug 17, 2025

• [mypyc] feat: exact_dict_rprimitive

  #19677 opened Aug 18, 2025

• Implement PEP 800 (@disjoint_base)

  #19678 opened Aug 18, 2025

• Force all deserialized objects to the oldest GC generation

  #19681 opened Aug 18, 2025

• Fix color output logic

  #19685 opened Aug 19, 2025

6 Issues closed by 4 people

• Type narrowing fails with isinstance(self, Protocol) when result is stored in a variable

  #19684 closed Aug 18, 2025

• `a: Type[T]` does not accept parameter of type `TypeAliasType`

  #19661 closed Aug 15, 2025

• tuple expression gives different result than equivalent `TypeVarTuple` usage.

  #19665 closed Aug 15, 2025

• function untyped after decorator transformation

  #19589 closed Aug 15, 2025

• `name-defined` is whitespace-dependent

  #19632 closed Aug 14, 2025

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

  #19641 closed Aug 14, 2025

11 Issues opened by 7 people

• Bug Report: Inconsistent Return Type Checking Between Python 3.9.21 and 3.9.23 with Mypy​

  #19680 opened Aug 18, 2025

• Uncaught Error in Assignment of type Iterator[int] to type Iterator[str]

  #19675 opened Aug 17, 2025

• Type-narrowing based on instance type

  #19671 opened Aug 15, 2025

• Make enums idempotent

  #19669 opened Aug 15, 2025

• `mypy` doesn't understand that `*args: P.args` implies that `args` is a `tuple`

  #19663 opened Aug 15, 2025

• `mypy` fails to correctly understand some iterable type in `*args`

  #19662 opened Aug 15, 2025

• Cannot instantiate type "Type[None]"

  #19660 opened Aug 14, 2025

• Mypy 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

28 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 18, 2025 • 11 new comments

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

  #19511 commented on Aug 15, 2025 • 7 new comments

• feat: new mypyc primitives for weakref.proxy

  #19217 commented on Aug 18, 2025 • 3 new comments

• [mypyc] feat: cache len for container creation from expressions with length known at compile time

  #19503 commented on Aug 17, 2025 • 2 new comments

• Remove the Anys from mypy/config_parser.py

  #19637 commented on Aug 14, 2025 • 1 new comment

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

  #19630 commented on Aug 18, 2025 • 1 new comment

• [refactor] Remove code that "disables deprecation warnings about \u"

  #19606 commented on Aug 16, 2025 • 1 new comment

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

  #19145 commented on Aug 18, 2025 • 1 new comment

• Special case TypedDict.get

  #19639 commented on Aug 15, 2025 • 0 new comments

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

  #19631 commented on Aug 18, 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: `__repr__` method for RefExpr and NameExpr

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

• Add functools.lru_cache plugin support Fixes #16261

  #19432 commented on Aug 17, 2025 • 0 new comments

• Draft: Solve intermediate variable bug

  #19399 commented on Aug 16, 2025 • 0 new comments

• [mypyc] Implement `str.lower()` and `str.upper()` primitive

  #19375 commented on Aug 17, 2025 • 0 new comments

• Handle `__hash__ = None` in somewhat more intuitive fashion

  #19168 commented on Aug 15, 2025 • 0 new comments

• Enable warn_unreachable = True for `mypyc` and all other files as well

  #19050 commented on Aug 15, 2025 • 0 new comments

• Consider property access from class objects (now for real)

  #18969 commented on Aug 15, 2025 • 0 new comments

• Support name mangling

  #16715 commented on Aug 16, 2025 • 0 new comments

• 'Subclass of "A" and "B" cannot exist: would have incompatible method signatures' is usually wrong

  #19377 commented on Aug 18, 2025 • 0 new comments

• functools.partialmethod not supported properly?

  #8619 commented on Aug 17, 2025 • 0 new comments

• Type narrowing when list variable is reassigned

  #19528 commented on Aug 17, 2025 • 0 new comments

• mypy rejects unpacking into same variable

  #14786 commented on Aug 16, 2025 • 0 new comments

• Can't call get on an empty dict

  #17684 commented on Aug 16, 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 alias and union wrong revealed type

  #19640 commented on Aug 12, 2025 • 0 new comments