[issue34488] improve performance of BytesIO.writelines() by avoiding creation of unused PyLongs

[Sergey Fedoseev]

Sergey Fedoseev <fedoseev.sergey at gmail.com> added the comment:

`BytesIO.write()` and `BytesIO.writelines()` are independent of each other.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34488>
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