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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 601045ceff94 by Serhiy Storchaka in branch 'default':
Issue #15381: Optimized line reading in io.BytesIO.
http://hg.python.org/cpython/rev/601045ceff94

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<http://bugs.python.org/issue15381>
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