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https://issues.apache.org/jira/browse/COLLECTIONS-366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13596146#comment-13596146
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Thomas Neidhart commented on COLLECTIONS-366:
---------------------------------------------

That's actually the same behavior as IntRange.containsNumber in commons-lang 
2.x, it is a matter of definition imho.
                
> A light-weight list of integers
> -------------------------------
>
>                 Key: COLLECTIONS-366
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-366
>             Project: Commons Collections
>          Issue Type: New Feature
>    Affects Versions: 3.2
>            Reporter: Dmitry Katsubo
>             Fix For: 4.x
>
>         Attachments: COLLECTIONS-366.patch, RangeList_fixed1.zip
>
>
> Sometimes there is a demand too have a list, that represents numbers within 
> some range (say, [5..10]). If the range is big (millions of records), 
> creating a dummy list that holds all instances of objects is too expensive.
> The provided implementation (attached to this issue) solves this problem. 
> Nice to have in commons collections.

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