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DOC: whatsnew for GH #18819 #20901

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May 1, 2018
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DOC: whatsnew for GH #18819 #20901

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1 change: 1 addition & 0 deletions doc/source/whatsnew/v0.23.0.txt
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- Bug in :func:`DataFrame.unstack` which raises an error if ``index`` is a ``MultiIndex`` with unused labels on the unstacked level (:issue:`18562`)
- Fixed construction of a :class:`Series` from a ``dict`` containing ``NaN`` as key (:issue:`18480`)
- Fixed construction of a :class:`DataFrame` from a ``dict`` containing ``NaN`` as key (:issue:`18455`)
- Disabled construction of a :class:`Series` where len(index) > len(data) = 1, which previously would broadcast the data item, and now raises a ``ValueError`` (:issue:`18819`)
- Suppressed error in the construction of a :class:`DataFrame` from a ``dict`` containing scalar values when the corresponding keys are not included in the passed index (:issue:`18600`)

- Fixed (changed from ``object`` to ``float64``) dtype of :class:`DataFrame` initialized with axes, no data, and ``dtype=int`` (:issue:`19646`)
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