[issue33671] Efficient zero-copy for shutil.copy* functions (Linux, OSX and Win)

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

shutil.COPY_BUFSIZE isn't documented. Is it a deliberate choice?
https://docs.python.org/dev/library/shutil.html

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<https://bugs.python.org/issue33671>
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