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https://issues.apache.org/jira/browse/COLLECTIONS-495?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Neidhart resolved COLLECTIONS-495.
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    Resolution: Fixed

Fixed in r1540763.

> UnmodifiableTrie should not decorate an already unmodifiable Trie
> -----------------------------------------------------------------
>
>                 Key: COLLECTIONS-495
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-495
>             Project: Commons Collections
>          Issue Type: Bug
>    Affects Versions: 4.0-alpha1
>            Reporter: Thomas Neidhart
>            Priority: Minor
>             Fix For: 4.0
>
>
> An already unmodifiable trie was decorated again.
> To be consistent with the other Unmodifiable wrappers, in this case the 
> object itself shall be returned.
> Also the return type shall be changed to Trie.



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