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https://issues.apache.org/jira/browse/LUCENE-2094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12781994#action_12781994
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Simon Willnauer commented on LUCENE-2094:
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bq. It would not hurt, the Set is only used for analyzers that all take a
version param... It is not really a public API.
So the thing here is that lowercasing for supplementary characters does only
apply to a hand ful of chars see this link
http://unicode.org/cldr/utility/list-unicodeset.jsp?a=[[%3ACase_Sensitive%3DTrue%3A]%26[^[\u0000-\uFFFF]]]&esc=on
Those characters are from the Deseret Alphabet (mormons) which means we are
introducing a "pain in the neck" Version flag into CharArraySet for about 40
chars which would be broken?! I don't see this here! Nothing personal related
to the Deseret Alphabet or anyone who is using it but this seem a bit too much
of a hassle. It would make the code very ugly though.
simon
> 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.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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