BUG: Incorrect float format in object column

[simonjayhawkins]

from #35580 (comment)

---

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

Code Sample, a copy-pastable example

>>> pd.Series([1.0]).astype(object)
0    1
dtype: object
>>>

Problem description

[this should explain why the current behaviour is a problem and why the expected output is a better solution]

Expected Output

>>> pd.Series([1.0]).astype(object)
0    1.0
dtype: object

Output of pd.show_versions()

[paste the output of pd.show_versions() here leaving a blank line after the details tag]

[mzeitlin11]

Fixed on master, but could probably use a test

[mdhsieh]

I can try making one.

[mdhsieh]

take