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

[Serhiy Storchaka]

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

> There seems to be a problem with the patch: when you store the getvalue() result somewhere (instead of discarding it), things get much slower:

This problem exists with the new patch?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15381>
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