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Posted to notifications@groovy.apache.org by "Paul King (Jira)" <ji...@apache.org> on 2026/10/20 01:27:02 UTC

[jira] [Closed] (GROOVY-11807) MapWithDefault can break type safety of key set

     [ https://issues.apache.org/jira/browse/GROOVY-11807?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paul King closed GROOVY-11807.
------------------------------

> MapWithDefault can break type safety of key set
> -----------------------------------------------
>
>                 Key: GROOVY-11807
>                 URL: https://issues.apache.org/jira/browse/GROOVY-11807
>             Project: Groovy
>          Issue Type: Bug
>          Components: groovy-jdk
>            Reporter: Eric Milles
>            Assignee: Paul King
>            Priority: Major
>             Fix For: 6.0.0-alpha-2
>
>
> {code}
> Map<Number,?> map = [:].withDefault{ null }
> assert map.get('x') == null
> Number k = map.keySet()[0]
> {code}
> GroovyCastException: Cannot cast object 'x' with class 'java.lang.String' to class 'java.lang.Number'



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