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https://issues.apache.org/jira/browse/LUCENE-1946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12764472#action_12764472
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Uwe Schindler commented on LUCENE-1946:
---------------------------------------

This is correct. But e.g. NumberTools and DateTools will also stay deprecated 
in 3.0, because you need them to use Indexes from previous versions.

So there is a difference between deprecated APIs and deprecated functionality 
that is maybe needed, as long as old indexes are available. With 4.0 we will 
change the index format and then the problem is gone.

But I agree with you, the differences between both classes are so minimal and 
only western european languages would have used the ISO filter. The superset 
does not hurt, only when extended chars (>255) are involved.

> Remove deprecated TokenStream API
> ---------------------------------
>
>                 Key: LUCENE-1946
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1946
>             Project: Lucene - Java
>          Issue Type: Task
>          Components: Analysis, contrib/analyzers
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>             Fix For: 3.0
>
>         Attachments: LUCENE-1946.patch, LUCENE-1946.patch, LUCENE-1946.patch
>
>
> I looked into clover analysis: It seems to be no longer used since I removed 
> the tests yesterday - I am happy!

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