[issue29659] Expose the `length` arg from shutil.copyfileobj for public use

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

bpo-33671 fixed this.

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resolution:  -> fixed
stage: test needed -> resolved
status: open -> closed
versions: +Python 3.8 -Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue29659>
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