Delete workarounds for fixed typeshed bugs (#12093)

Author: Akuli

mypy/checkexpr.py

@@ -4,7 +4,7 @@
 from contextlib import contextmanager
 import itertools
 from typing import (
-    Any, cast, Dict, Set, List, Tuple, Callable, Union, Optional, Sequence, Iterator
+    cast, Dict, Set, List, Tuple, Callable, Union, Optional, Sequence, Iterator
 )
 from typing_extensions import ClassVar, Final, overload, TypeAlias as _TypeAlias
 
@@ -1607,8 +1607,7 @@ def check_overload_call(self,
                 # Record if we succeeded. Next we need to see if maybe normal procedure
                 # gives a narrower type.
                 if unioned_return:
-                    # TODO: fix signature of zip() in typeshed.
-                    returns, inferred_types = cast(Any, zip)(*unioned_return)
+                    returns, inferred_types = zip(*unioned_return)
                     # Note that we use `combine_function_signatures` instead of just returning
                     # a union of inferred callables because for example a call
                     # Union[int -> int, str -> str](Union[int, str]) is invalid and

mypy/ipc.py

@@ -54,9 +54,6 @@ def read(self, size: int = 100000) -> bytes:
         if sys.platform == 'win32':
             while True:
                 ov, err = _winapi.ReadFile(self.connection, size, overlapped=True)
-                # TODO: remove once typeshed supports Literal types
-                assert isinstance(ov, _winapi.Overlapped)
-                assert isinstance(err, int)
                 try:
                     if err == _winapi.ERROR_IO_PENDING:
                         timeout = int(self.timeout * 1000) if self.timeout else _winapi.INFINITE