[issue40654] shutil.copyfile mutates symlink for absolute path

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

This is only an issue for broken symlinks, right? (More precisely, those that cannot be resolved, which may include very long paths on some machines.) 

Fixing copy is my preferred option.

Also Jason, what do you need to be able to test against prerelease? It would be nice to find these impacts during alpha/beta rather than three bug fix releases later.

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