Message 317989 - Python tracker

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Yes, I tried changing benchmarks order and zero-copy variants are always faster. As for instantaneous CoW copy, it is debatable. E.g. "cp" command does not do it by default:   
https://unix.stackexchange.com/questions/80351/why-is-cp-reflink-auto-not-the-default-behaviour
I think shutil should follow the same lead, and perhaps provide a cow=bool argument in the future.