`spearman` returns NaN.
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Bug
- Dominant language
- Haskell
- Stars
- 309
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- 76
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- No merged PRs in 30d
Description
`spearman` should return Nothing rather than NaN:
`spearman $ V.fromList [(1, 3), (5, 3)]`, or any case where one of the two variables is a constant.
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