BUG: segmentation fault with pd.NA and np.ndarray.__contains__
Testing for membership in an ndarray segfaults:

```
In [1]: pd.NA in np.array(["a"], dtype=object) 
Segmentation fault (core dumped)
```

Now, this might be something that needs to be fixed in numpy, as for plain lists it "works":

```
In [3]: pd.NA in ['a']  
...
TypeError: boolean value of NA is ambiguous
```

but numpy might not expect an error instead of True/False.