Library
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+- Issue #16820: In configparser, `parser.popitem()` no longer raises ValueError.
+ This makes `parser.clean()` work correctly.
+
+- Issue #16820: In configparser, ``parser['section'] = {}`` now preserves
+ section order within the parser. This makes `parser.update()` preserve section
+ order as well.
+
- Issue #9644: Fix the encoding used by os.statvfs(): use the filesystem
encoding with the surrogateescape error handler, instead of UTF-8 in strict
mode.