Use File::Copy::move to attempt an atomic mirror #401
Merged
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In most situations this will Just Work, but some operating systems don't support an atomic rename over an existing file and there's nothing we can do about it.
In any case, the conversation around #217 was a bit overwhelming when IMO File::Copy::move already does the right thing. I think this will fix things while documenting just enough that people will be aware of the caveats.