Kruskal Wallis out of range

[GregorySchwartz]

Error with a vector of two vectors, one of length 4752 and one of length 1974: Statistics.Types.mkPValue: probability is out if [0,1] range.

[GregorySchwartz]

Here is a simple example:

Stat.kruskalWallisTest [U.fromList [0,0,0,0,0], U.fromList [0,0,0,0,0]]

This error occurs when all values in both groups are tied (the lengths of the vectors can be the same or different). I would expect a p-value of Nothing.