[issue33639] Use high-performance os.sendfile() in shutil.copy*

[desbma]

desbma <dutch109 at gmail.com> added the comment:

Honestly, whatever gets this thing moving forward is good with me.

I'm a bit depressed by the number of issues here that have a good patch waiting to be merged, or even read, and that languish for years.

I haven't read your patch in detail, but if others agree that it is better than mine and can be merged, let's do it.

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<https://bugs.python.org/issue33639>
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