diff -r 8d9767bf4adb -r 54d9f496f07a mercurial/encoding.py
--- a/mercurial/encoding.py	Fri Oct 04 23:23:24 2024 -0400
+++ b/mercurial/encoding.py	Sat Oct 05 15:00:37 2024 -0400
@@ -26,11 +26,12 @@
     pycompat,
 )
 
+from .interfaces import modules as intmod
 from .pure import charencode as charencodepure
 
 _Tlocalstr = TypeVar('_Tlocalstr', bound='localstr')
 
-charencode = policy.importmod('charencode')
+charencode: intmod.CharEncoding = policy.importmod('charencode')
 
 isasciistr = charencode.isasciistr
 asciilower = charencode.asciilower
@@ -41,15 +42,6 @@
 
 unichr = chr
 
-if typing.TYPE_CHECKING:
-    # TODO: make a stub file for .cext.charencode, and import here
-    from .pure.charencode import (
-        asciilower,
-        asciiupper,
-        isasciistr,
-        jsonescapeu8fast as _jsonescapeu8fast,
-    )
-
 
 # These unicode characters are ignored by HFS+ (Apple Technote 1150,
 # "Unicode Subtleties"), so we need to ignore them in some places for