gh-109653: Avoid a top-level import of types in functools (#109804)

Author: AlexWaygood

Lib/functools.py

@@ -19,8 +19,9 @@
 # import types, weakref  # Deferred to single_dispatch()
 from reprlib import recursive_repr
 from _thread import RLock
-from types import GenericAlias
 
+# Avoid importing types, so we can speedup import time
+GenericAlias = type(list[int])
 
 ################################################################################
 ### update_wrapper() and wraps() decorator

Misc/NEWS.d/next/Library/2023-09-24-13-28-35.gh-issue-109653.9IFU0B.rst

@@ -0,0 +1,2 @@
+Improve import time of :mod:`functools` by around 13%. Patch by Alex
+Waygood.