BUG: Presence of pd.NA value in pd.Series prevents values from being rounded

[mijalapenos]

Pandas version checks

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

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

• I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

import pandas as pd
pd.Series([1.123, 2.123, pd.NA]).round(0)

Issue Description

Presence of pd.NA value in pd.Series prevents values from being rounded.

>>> pd.Series([1.123, 2.123, pd.NA]).round(0)
0    1.123
1    2.123
2     <NA>
dtype: object

Expected Behavior

I would expect the same behavior as with np.nan values:

>>> pd.Series([1.123, 2.123, np.nan]).round(0)
0    1.0
1    2.0
2    NaN
dtype: float64

Installed Versions

/Users//miniforge3/envs/nlp/lib/python3.9/site-packages/_distutils_hack/init.py:33: UserWarning: Setuptools is replacing distutils.
warnings.warn("Setuptools is replacing distutils.")

INSTALLED VERSIONS

commit : d9cdd2e
python : 3.9.16.final.0
python-bits : 64
OS : Darwin
OS-release : 24.1.0
Version : Darwin Kernel Version 24.1.0: Thu Oct 10 21:05:14 PDT 2024; root:xnu-11215.41.3~2/RELEASE_ARM64_T8103
machine : arm64
processor : arm
byteorder : little
LC_ALL : None
LANG : None
LOCALE : None.UTF-8

pandas : 2.2.2
numpy : 1.25.2
pytz : 2023.3.post1
dateutil : 2.8.2
setuptools : 68.2.2
pip : 23.2.1
Cython : None
pytest : 7.4.0
hypothesis : None
sphinx : None
blosc : None
feather : None
xlsxwriter : None
lxml.etree : 4.9.3
html5lib : None
pymysql : None
psycopg2 : None
jinja2 : 3.1.2
IPython : 8.16.1
pandas_datareader : None
adbc-driver-postgresql: None
adbc-driver-sqlite : None
bs4 : 4.12.2
bottleneck : None
dataframe-api-compat : None
fastparquet : None
fsspec : 2023.10.0
gcsfs : None
matplotlib : 3.8.0
numba : None
numexpr : None
odfpy : None
openpyxl : None
pandas_gbq : None
pyarrow : 14.0.1
pyreadstat : None
python-calamine : None
pyxlsb : None
s3fs : None
scipy : 1.11.3
sqlalchemy : None
tables : None
tabulate : None
xarray : None
xlrd : None
zstandard : None
tzdata : 2023.3
qtpy : None
pyqt5 : None

[rhshadrach]

Thanks for the report. When you do not specify a dtype, pandas results in object dtype here. round() does not impact object dtype.

res = pd.Series([1.123, 2.123, pd.NA], dtype="Float64").round(0)
print(res)
# 0     1.0
# 1     2.0
# 2    <NA>
# dtype: Float64

That pandas does not infer Float64 without the dtype is #33662.

Closing.