Handle safe_copy failing to hardlink on Windows due to too many existing links #2394
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Windows does support hard links, and os.link() supports Windows as of Python 3.2. There is a specific error that can be thrown on Windows when you try to create too many hardlinks to a file. Handle that case explicitly in its own test. It's more precise than trying to infer an errno for it which may be mapped to by various kinds of errors.