Storing python xp.constraint objects in numpy arrays or pandas Series

I am using Xpress 8.11.3 conda package. Seems like it is fixed in 8.12 . So that explains it.

Unfortunately, that numpy array with a dtype of `xp.npconstraint` can't be put in a pandas `Series` in 8.11.3:

import xpress as xp
import numpy as np
import pandas as pd
 
v = xp.var("v")
ct = xp.constraint(v >= 0)
ctl = [ct]
 
na = np.array(ctl, dtype=xp.npconstraint)
print("na is ", na)
s2 = pd.Series(na)
print("s2 is ", s2)

This produces:

  File "/home/ubuntu/anaconda3/envs/optiwrap37/lib/python3.7/site-packages/pandas/core/series.py", line 307, in __init__
    "Cannot construct a Series from an ndarray with "
ValueError: Cannot construct a Series from an ndarray with compound dtype.  Use DataFrame instead.

Using `DataFrame` doesn't work either.