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https://issues.apache.org/jira/browse/COLLECTIONS-881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18047779#comment-18047779
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Gary D. Gregory commented on COLLECTIONS-881:
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Good question... PR 669 adopts the copying approach, which involves a behavior
change. Is this a bug to fix, or will the change risk breaking existing apps?
> MultiMapUtils - review the getValuesAsXXX methods for changes to backing Map
> ----------------------------------------------------------------------------
>
> Key: COLLECTIONS-881
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-881
> Project: Commons Collections
> Issue Type: Bug
> Reporter: Sebb
> Priority: Major
>
> As per the TODO comment
> [https://github.com/apache/commons-collections/blob/fab8020385737d57c66ae1ca4164dfeec039741e/src/main/java/org/apache/commons/collections4/MultiMapUtils.java#L138]
> some of the getXXX methods may allow changes to the returned collection to
> affect the backing Map.
> This needs fixing and/or documenting
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