[issue40105] Updating zip comment doesn't truncate the zip file

[mzr]

Change by mzr <mzr4141 at gmail.com>:


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pull_requests: +18700
pull_request: https://github.com/python/cpython/pull/19337

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40105>
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