BUG/TYP: 1.3.0 index.values returns ExtensionArray | ndarray instead of ndarray

[twoertwein]

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of pandas.

• (optional) I have confirmed this bug exists on the master branch of pandas.

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Probably an intended change, but I didn't find anything related to it in the whatsnew.

import pandas as pd

df = pd.DataFrame({"a": [1]})

reveal_type(df.values)
reveal_type(df.index.values)

pyright with 1.2.4

info: Type of "df.values" is "ndarray"
info: Type of "df.index.values" is "ndarray"

pyright with 1.3.0.rc1

info: Type of "df.values" is "ndarray"
info: Type of "df.index.values" is "ExtensionArray | ndarray"

[jorisvandenbossche]

That seems a correct change indeed

I didn't find anything related to it in the whatsnew.

I don't think we generally list typing changes/fixes in the whatsnew

[simonjayhawkins]

That seems a correct change indeed

agreed.

pandas/pandas/core/indexes/base.py

Lines 4273 to 4293 in a1412a0

	@property
	def values(self) -> ArrayLike:
	"""
	Return an array representing the data in the Index.
	.. warning::
	We recommend using :attr:`Index.array` or
	:meth:`Index.to_numpy`, depending on whether you need
	a reference to the underlying data or a NumPy array.
	Returns
	-------
	array: numpy.ndarray or ExtensionArray
	See Also
	--------
	Index.array : Reference to the underlying data.
	Index.to_numpy : A NumPy array representing the underlying data.
	"""
	return self._data

I don't think we generally list typing changes/fixes in the whatsnew

agreed. the type of the property is unchanged. only the type annotation has been changed (in #38531)