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https://issues.apache.org/jira/browse/LUCENE-2094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783765#action_12783765
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Uwe Schindler commented on LUCENE-2094:
---------------------------------------

...Solr can also use the version to do this.

We removed the posIncr ctors also for a lot of Analyzers (StandardAnalzer,...), 
so why not also remove (deprecate and remove in 4.0)  from StopFilter? There is 
another issue open, that says: Remove all per-instance setters and make all 
filters final (I think it was the hell issue). All parameters should be passed 
on ctor and that prferably using version. Alternate an ctor only taking 
booleans, but most of the were removed in 3.0. The only relict in core is 
StopFilter.

So the ctor taking version should not make posIncr available and the other way 
round. If you want to control the falgs yourself, create an ctor with posIncr 
and smartjava5unicode switches (ugly).

> Prepare CharArraySet for Unicode 4.0
> ------------------------------------
>
>                 Key: LUCENE-2094
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2094
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Analysis
>    Affects Versions: 1.9, 2.0.0, 2.1, 2.2, 2.3, 2.3.1, 2.3.2, 2.3.3, 2.4, 
> 2.4.1, 2.4.2, 2.9, 2.9.1, 2.9.2, 3.0, 3.0.1, 3.1
>            Reporter: Simon Willnauer
>            Assignee: Uwe Schindler
>             Fix For: 3.1
>
>         Attachments: LUCENE-2094.patch, LUCENE-2094.patch, LUCENE-2094.patch, 
> LUCENE-2094.txt, LUCENE-2094.txt, LUCENE-2094.txt
>
>
> CharArraySet does lowercaseing if created with the correspondent flag. This 
> causes that  String / char[] with uncode 4 chars which are in the set can not 
> be retrieved in "ignorecase" mode.

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