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https://issues.apache.org/jira/browse/GROOVY-11807?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King resolved GROOVY-11807.
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Fix Version/s: 6.0.0-alpha-2
Resolution: Fixed
> 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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