[issue37157] shutil: add reflink=False to file copy functions to control clone/CoW copies (use copy_file_range)

[Giampaolo Rodola']

Giampaolo Rodola' <g.rodola at gmail.com> added the comment:

Adding a new patch (still a PoC, will create a PR when I have something more solid).

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Added file: https://bugs.python.org/file48393/cow2.diff

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