[issue15489] Correct __sizeof__ support for BytesIO

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Antoine, it looks like you committed the wrong patch for 3.3. Patches for 3.2 and 3.3 are different, otherwise I would have provided a one patch.

-        basesize = support.calcobjsize('P2PP2PP')
+        basesize = support.calcobjsize('P2nN2Pn')

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<http://bugs.python.org/issue15489>
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