BUG: pandas.Series.round not yet implemented for FloatingArray

[klanderson]

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

• [ X] 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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Note: Please read this guide detailing how to provide the necessary information for us to reproduce your bug.

Code Sample, a copy-pastable example

import pandas as pd
df = pd.DataFrame([{'a':1.2},{'a':2.5}])
df = df.convert_dtypes()
df['a'] = df['a'].round()

Problem description

Getting an error when applying round to a Series with new FloatingArray.

import pandas as pd
df = pd.DataFrame([{'a':1.2},{'a':2.5}])
df = df.convert_dtypes()
df['a'] = df['a'].round()

The error message is:

File ".../lib/python3.8/site-packages/pandas/core/series.py", line 2183, in round
    result = self._values.round(decimals)
AttributeError: 'FloatingArray' object has no attribute 'round'

Expected Output

rounded floats

Output of pd.show_versions()

INSTALLED VERSIONS

commit : 3e89b4c
python : 3.8.5.final.0
python-bits : 64
OS : Darwin
OS-release : 20.2.0
Version : Darwin Kernel Version 20.2.0: Wed Dec 2 20:39:59 PST 2020; root:xnu-7195.60.75~1/RELEASE_X86_64
machine : x86_64
processor : i386
byteorder : little
LC_ALL : None
LANG : en_US.UTF-8
LOCALE : en_US.UTF-8

pandas : 1.2.0
numpy : 1.19.4
pytz : 2020.4
dateutil : 2.8.1
pip : 20.3
setuptools : 50.3.2.post20201201
Cython : None
pytest : 6.1.2
hypothesis : None
sphinx : None
blosc : None
feather : None
xlsxwriter : None
lxml.etree : None
html5lib : None
pymysql : None
psycopg2 : None
jinja2 : 2.11.2
IPython : 7.19.0
pandas_datareader: None
bs4 : None
bottleneck : None
fsspec : 0.8.4
fastparquet : None
gcsfs : 0.7.1
matplotlib : None
numexpr : None
odfpy : None
openpyxl : None
pandas_gbq : None
pyarrow : None
pyxlsb : None
s3fs : None
scipy : None
sqlalchemy : 1.3.20
tables : None
tabulate : None
xarray : None
xlrd : None
xlwt : None
numba : None

[jreback]

PRs are welcome to implement as these are new arrays

[codebraker]

I am currently having Pandas 1.2.4. Is this fix included here?

[jreback]

1.3

[yishairasowsky]

@jreback @klanderson @codebraker @rhshadrach @jd
so what was the answer?