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DOC: Clarify that unique() promotes dtype to 64-bit #27869

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DOC: Clarify that unique() promotes dtype to 64-bit #27869

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1 change: 1 addition & 0 deletions pandas/core/algorithms.py
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Expand Up @@ -320,6 +320,7 @@ def unique(values):
of appearance. This does NOT sort.

Significantly faster than numpy.unique. Includes NA values.
For numeric input, the dtype of the result will be promoted to 64-bit.

Parameters
----------
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1 change: 1 addition & 0 deletions pandas/core/indexes/base.py
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Expand Up @@ -2122,6 +2122,7 @@ def dropna(self, how="any"):
Returns
-------
Index without duplicates
For numeric input, the dtype of the result will be promoted to 64-bit.

See Also
--------
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5 changes: 3 additions & 2 deletions pandas/core/series.py
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Expand Up @@ -1910,8 +1910,9 @@ def unique(self):

Notes
-----
Returns the unique values as a NumPy array. In case of an
extension-array backed Series, a new
Returns the unique values as a NumPy array.
For numeric input, the dtype of the result will be promoted to 64-bit.
In case of an extension-array backed Series, a new
:class:`~api.extensions.ExtensionArray` of that type with just
the unique values is returned. This includes

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