[issue29949] sizeof set after set_merge() is doubled from 3.5

[INADA Naoki]

INADA Naoki added the comment:

See set_update_internal().
https://github.com/python/cpython/blob/master/Objects/setobject.c#L969-L1016

This happens only when iterable is set or dict.

>>> import sys
>>> sys.getsizeof(set(range(10)))
736
>>> sys.getsizeof(set(set(range(10))))
1248
>>> sys.getsizeof(set(dict.fromkeys(range(10))))
1248

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<http://bugs.python.org/issue29949>
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