py3: drop redundant `u''` prefixes on string literals Strings are unicode on Python 3. These were rewritten by `pyupgrade`. It's arguably better to fix the `contrib` stuff upstream and then re-vendor it, but I don't feel like waiting for that, and then all of the regression testing involved to get a minor improvement in the codebase. It was last vendored 5 years ago, and will likely be a large change anyway to drop py2 support. Also, we've already made minor formatting changes to it locally.

--- a/mercurial/hgweb/wsgiheaders.py	Mon Jan 06 14:07:43 2025 -0500
+++ b/mercurial/hgweb/wsgiheaders.py	Mon Jan 06 14:15:40 2025 -0500
@@ -48,8 +48,8 @@
         if type(value) is bytes:
             return value
         raise AssertionError(
-            u"Header names/values must be"
-            u" of type bytes (got %s)" % repr(value)
+            "Header names/values must be"
+            " of type bytes (got %s)" % repr(value)
         )
 
     def __len__(self):