[issue15381] Optimize BytesIO to so less reallocations when written, similarly to StringIO

[Serhiy Storchaka]

Serhiy Storchaka <storchaka at gmail.com> added the comment:

> I wonder if this is a fair comparison, Serhiy.

I just used your examples.

> When re-running your tests with larger chunks, the results are quite interesting:

Well, now I see, that BytesIO slower StringIO.

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