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https://issues.apache.org/jira/browse/GROOVY-11308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17817193#comment-17817193
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ASF GitHub Bot commented on GROOVY-11308:
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octylFractal opened a new pull request, #2056:
URL: https://github.com/apache/groovy/pull/2056
The documentation for this method states that when `mutate` is false, a new
collection is _always_ returned. The previous code only did so when
`self.size()` was greater than 1, and otherwise returned null.
> DefaultGroovyMethods#unique now returns null for empty or 1 element input
> -------------------------------------------------------------------------
>
> Key: GROOVY-11308
> URL: https://issues.apache.org/jira/browse/GROOVY-11308
> Project: Groovy
> Issue Type: Bug
> Components: groovy-runtime
> Affects Versions: 3.0.21, 4.0.19, 5.0.0-alpha-6
> Reporter: Octavia Togami
> Priority: Critical
>
> https://github.com/apache/groovy/commit/c181ef72e442f1d51855e0db6d44ab302cf7c662
> changed the behavior of {{DefaultGroovyMethods#unique}} to return {{null}}
> for an empty or one element collection input when {{mutate}} is {{false}}.
> This requires a really awkward workaround and breaks compatibility with
> previous versions, and I personally don't think the behavior makes sense.
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