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https://issues.apache.org/jira/browse/GROOVY-7905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15420270#comment-15420270
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Jochen Theodorou commented on GROOVY-7905:
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going to a more specific type is usually less a problem than going to a more
general type.
> ListWithDefault DGM methods aren't type inference friendly
> ----------------------------------------------------------
>
> Key: GROOVY-7905
> URL: https://issues.apache.org/jira/browse/GROOVY-7905
> Project: Groovy
> Issue Type: Improvement
> Reporter: Paul King
> Assignee: Paul King
>
> For the following script:
> {code}
> @groovy.transform.CompileStatic
> def method() {
> def list = [].withDefault{ it.longValue() }
> list[0] = list[3]
> assert list[0] == 3 && list[0].class == Long
> }
> method()
> {code}
> The list access call {{list[3]}} doesn't funnel through the
> {{ListWithDefault.getAt(int)}} method but instead the {{DGM.getAt(List,
> int)}} method since {{List}} is the inferred type. The {{withDefault}}
> methods could instead return the more specific type and then the correct type
> will be inferred and the expected behavior is observed.
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