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https://issues.apache.org/jira/browse/GROOVY-11308?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King resolved GROOVY-11308.
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Fix Version/s: 3.0.21
4.0.19
5.0.0-alpha-6
Resolution: Fixed
> 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
> Assignee: Paul King
> Priority: Critical
> Fix For: 3.0.21, 4.0.19, 5.0.0-alpha-6
>
>
> 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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