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/pycompat.py	Mon Jan 06 14:07:43 2025 -0500
+++ b/mercurial/pycompat.py	Mon Jan 06 14:15:40 2025 -0500
@@ -261,7 +261,7 @@
             return s
         if not isinstance(s, (bytes, bytearray)) and (
             isinstance(s, type)
-            or not builtins.hasattr(s, u'__bytes__')  # hasattr-py3-only
+            or not builtins.hasattr(s, '__bytes__')  # hasattr-py3-only
         ):
             s = str(s).encode('ascii')
         return bytes.__new__(cls, s)