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https://issues.apache.org/jira/browse/COLLECTIONS-657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16172149#comment-16172149
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Igor Savin commented on COLLECTIONS-657:
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After digging in further to create a reproduction test, figured out it's
actually an issue with how equals is implemented in Drools library.
> "union" method is resulting in data loss
> ----------------------------------------
>
> Key: COLLECTIONS-657
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-657
> Project: Commons Collections
> Issue Type: Bug
> Affects Versions: 4.1
> Reporter: Igor Savin
> Priority: Critical
>
> Create 2 instances of StringReader from strings (1 and 2), put them into a
> list A.
> Create empty list B.
> Call CollectionUtils.union(A, B);
> Expected result: [1, 2]
> Actual result: [1, 1].
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