Describe the issue:

Passing an array of unique values to np.unique returns an array with non-unique values.

I believe this problem may be related to the previously reported issue #27037, which was resolved in version 2.1.0 of NumPy. However, this fix is available only for Python versions 3.10 or later. Consequently, when installing NumPy for Python version 3.9 from PyPI without specifying a version (e.g., pip install numpy), the installed version is 2.0.1, which still contains the bug.

Reproduce the code example:

import numpy as np
np.unique([1, 2, 3, 4, 5, ...])

Error message:

No response

Python and NumPy Versions:

2.0.1
3.9.19 (main, Aug 2 2024, 17:17:58) [GCC 10.2.1 20210130 (Red Hat 10.2.1-11)]

Runtime Environment:

No response

Context for the issue:

No response