Jakob Hansen

### Polars version checks - [X] I have checked that this issue has not already been reported. - [X] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of...

BUG: stats.spearmanr: incorrectly identifies arrays as constant

6

### Describe your issue. When `scipy.stats.spearmanr()` checks whether the input array is constant, it appears to only check whether the first two columns of the array are constant. This leads...