Steve Dower <steve.do...@python.org> added the comment:
My replies to Eryk's comment copied above:
Yes, always more tests :)
The behaviour of normpath has always been weird and/or incorrect around invalid
UNC paths.
For example, on 3.10, normpath("//spam///eggs/..") --> "\\\\spam". Originally,
the path was a file path (albeit with an invalid empty share name), and the
final path is just a machine name.
Currently on 3.11, normpath("//spam///eggs/..") --> "\\\\spam\\\\". This
doesn't match GetFullPathNameW, but at least it leaves the end of the path as a
file (with an empty share name).
I don't think it's necessarily obvious which is correct, though matching
GetFullPathNameW is certainly the easiest rule for us to use. Matching previous
Python versions is also reasonable, though given the input is invalid for its
domain we don't really have any obligation to preserve the result.
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<https://bugs.python.org/issue46287>
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