[issue13149] optimization for append-only StringIO

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 8d9a869db675 by Antoine Pitrou in branch 'default':
Issue #13149: Speed up append-only StringIO objects.
http://hg.python.org/cpython/rev/8d9a869db675

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nosy: +python-dev

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