BUG: Series.unique() terminates strings prematurely on null Bytes

[Nadrons]

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

outp = pd.Series(['A\x00B', 'A\x00C']).unique()

print(outp)

# prints:
# ['A\x00B']

Issue Description

Series.unique() fails to detect unique strings when null bytes are included.

As per this question and this issue, it seems that this is another case of strings being passed to a Cython function and terminating early on null bytes.

Expected Behavior

Should return ['A\x00B' 'A\x00C']

Installed Versions

pandas : 2.0.2

[sudoWin]

take

[rhshadrach]

Closing as a duplicate of #34551