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I think haskell random tests are a bit flaky, I constantly get weird results like
[1,-1] expected 1 bu got 0
,[0] expected -1 bu got 0
et cetera...C# Author doesn't want you to mutate the array, but never stated that in description. EVEN WORSE, is that it is not tested for in samples cases. A surprise edge case would be one thing, but this is a rule change after submit.