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https://issues.apache.org/jira/browse/GROOVY-11807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18092450#comment-18092450
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ASF GitHub Bot commented on GROOVY-11807:
-----------------------------------------
paulk-asert merged PR #2641:
URL: https://github.com/apache/groovy/pull/2641
> 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
>
> {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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