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/contrib/python-zstandard/tests/test_compressor.py	Mon Jan 06 14:07:43 2025 -0500
+++ b/contrib/python-zstandard/tests/test_compressor.py	Mon Jan 06 14:15:40 2025 -0500
@@ -1678,7 +1678,7 @@
         with self.assertRaisesRegex(
             TypeError, "item 0 not a bytes like object"
         ):
-            cctx.multi_compress_to_buffer([u"foo"])
+            cctx.multi_compress_to_buffer(["foo"])
 
     def test_empty_input(self):
         cctx = zstd.ZstdCompressor()