> Raising a SpecialFileError would be OK if `follow_symlinks` was False.

I expect it to fail if follow_symlinks is True, which is the default value. I expect it to succeed with follow_symlinks=False, which should create a shallow copy of just the symlink, regardless of its target. Instead, what happens is that it calls shutil._stat(fn) on both src and dst, regardless of follow_symlinks. I think the call should be shutil._stat(fn, follow_symlinks). This requires updating shutil._stat() to pass the value to fn.stat() and os.stat().