operator (https://github.com/canonical/operator)
+ ops/testing.py:399: error: Incompatible types in assignment (expression has type "str", variable has type "Optional[Dict[Any, Any]]")

sphinx (https://github.com/sphinx-doc/sphinx)
+ sphinx/cmd/quickstart.py: note: In function "main":
+ sphinx/cmd/quickstart.py:554:16: error: Incompatible return value type (got "Union[str, int, None]", expected "int")  [return-value]

porcupine (https://github.com/Akuli/porcupine)
+ porcupine/plugins/editorconfig.py:152: error: Argument 1 to "map" has incompatible type "Callable[[AnyStr], AnyStr]"; expected "Callable[[str], AnyStr]"  [arg-type]
+ porcupine/plugins/pluginmanager.py:133: error: Argument 1 to "map" has incompatible type "Callable[[AnyStr], AnyStr]"; expected "Callable[[str], AnyStr]"  [arg-type]

Expression (https://github.com/cognitedata/Expression)
- expression/extra/parser.py:302: error: Argument 1 to "map" has incompatible type "Callable[[_A], str]"; expected "Callable[[_A], _B]"
- expression/extra/parser.py:302: error: Incompatible return value type (got "str", expected "_B")
- expression/extra/parser.py:302: error: Argument 1 to "join" of "str" has incompatible type "_A"; expected "Iterable[str]"
+ expression/extra/parser.py:302: error: No overload variant of "join" of "str" matches argument type "_A"
+ expression/extra/parser.py:302: note: Possible overload variants:
+ expression/extra/parser.py:302: note:     def join(self, Iterable[str], /) -> str

streamlit (https://github.com/streamlit/streamlit)
- lib/tests/streamlit/runtime/legacy_caching/hashing_test.py:257:30: error: Unsupported operand types for + ("str" and "int")  [operator]
+ lib/tests/streamlit/runtime/legacy_caching/hashing_test.py:257:24: error: No overload variant of "__add__" of "str" matches argument type "int"  [operator]
+ lib/tests/streamlit/runtime/legacy_caching/hashing_test.py:257:24: note: Possible overload variants:
+ lib/tests/streamlit/runtime/legacy_caching/hashing_test.py:257:24: note:     def __add__(self, str, /) -> str

pylint (https://github.com/pycqa/pylint)
+ pylint/config/argument.py:370: error: Incompatible types in assignment (expression has type "Type[pylint.config.callback_actions._ExtendAction]", variable has type "Type[argparse._ExtendAction]")  [assignment]
+ pylint/config/argument.py:368: error: Unused "type: ignore" comment

mypy (https://github.com/python/mypy)
+ mypy/api.py:62: error: Incompatible types in assignment (expression has type "Union[str, int, None]", variable has type "int")  [assignment]

cwltool (https://github.com/common-workflow-language/cwltool)
+ cwltool/main.py: note: In function "main":
+ cwltool/main.py:1323:24: error: Incompatible return value type (got "Union[str, int, None]", expected "int")  [return-value]
+ tests/util.py: note: In function "get_main_output":
+ tests/util.py:110:14: error: Incompatible types in assignment (expression has type "Union[str, int, None]", variable has type "int")  [assignment]

core (https://github.com/home-assistant/core)
+ homeassistant/components/sonos/media.py:177: error: List item 0 has incompatible type "Optional[str]"; expected "None"  [list-item]

aiohttp (https://github.com/aio-libs/aiohttp)
+ aiohttp/multipart.py:95: error: Argument 1 to "map" has incompatible type "Callable[[AnyStr], AnyStr]"; expected "Callable[[str], AnyStr]"  [arg-type]