[issue29019] dict.fromkeys overallocates when given a sparse dict

[INADA Naoki]

INADA Naoki added the comment:

Since `seq` is checked by PyDict_CheckExact(seq) already,
((PyDictObject*)seq)->ma_used may be better.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29019>
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