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https://issues.apache.org/jira/browse/MATH-610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13420358#comment-13420358
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Gilles commented on MATH-610:
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The patch won't apply anymore; we would need an updated version. But let's
answer to your question first...
> [patch] objects that use compareTo should have equals as well
> -------------------------------------------------------------
>
> Key: MATH-610
> URL: https://issues.apache.org/jira/browse/MATH-610
> Project: Commons Math
> Issue Type: Improvement
> Reporter: Dave Brosius
> Priority: Trivial
> Fix For: 3.1
>
> Attachments: equals.diff
>
>
> NaturalRanking implements compareTo. Code that implements compareTo should
> also implement equals, and those that implement equals should implement
> hashCode. This patch does this.
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