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https://issues.apache.org/jira/browse/LUCENE-6914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15575706#comment-15575706
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Adrien Grand commented on LUCENE-6914:
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[~hossman] Let's commit this patch?

> DecimalDigitFilter skips characters in some cases (supplemental?)
> -----------------------------------------------------------------
>
>                 Key: LUCENE-6914
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6914
>             Project: Lucene - Core
>          Issue Type: Bug
>    Affects Versions: 5.4
>            Reporter: Hoss Man
>         Attachments: LUCENE-6914.patch, LUCENE-6914.patch, LUCENE-6914.patch
>
>
> Found this while writing up the solr ref guide for DecimalDigitFilter. 
> With input like "𝟙𝟡𝟠𝟜" ("Double Struck" 1984) the filter produces "1𝟡8𝟜" (1, 
> double struck 9, 8, double struck 4)  add some non-decimal characters in 
> between the digits (ie: "𝟙x𝟡x𝟠x𝟜") and you get the expected output 
> ("1x9x8x4").  This doesn't affect all decimal characters though, as evident 
> by the existing test cases.
> Perhaps this is an off by one bug in the "if the original was supplementary, 
> shrink the string" code path?



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