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https://issues.apache.org/jira/browse/LUCENE-2094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783393#action_12783393
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Uwe Schindler commented on LUCENE-2094:
---------------------------------------

bq. Either way, if the set is lowercased or not the lowercaseing is also 
applied to the values checked against the set.

If the LowerCaseFilter is applied before the stopwords, there is no need for 
doing irgnore-case-checking.

> 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
>             Fix For: 3.1
>
>         Attachments: 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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