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https://issues.apache.org/jira/browse/LUCENE-4519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13490176#comment-13490176
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Uwe Schindler commented on LUCENE-4519:
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I agree with this, the wildcard is useless here and not really user-friendly. I
think it was added to prevent some unchecked casts from different Field types,
which can still be done, if the called methods have correct generics.
I am not so happy with the FilterIterator change, but I agree that it is needed
here, otherwise it gets unchecked casts in the predicate.
> IndexDocument methods should not use wildcards in their return types
> --------------------------------------------------------------------
>
> Key: LUCENE-4519
> URL: https://issues.apache.org/jira/browse/LUCENE-4519
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Trivial
> Attachments: LUCENE-4519.patch
>
>
> {{public Iterable<? extends IndexableField> indexableFields()}} should be
> replaced with {{public Iterable<IndexableField> indexableFields()}}.
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