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https://issues.apache.org/jira/browse/LANG-1252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15397431#comment-15397431
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Rob Tompkins commented on LANG-1252:
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Linking issues that I think this issue generalizes.
> NumberUtils.isNumber and NumberUtils.createNumber resolve inconsistently
> ------------------------------------------------------------------------
>
> Key: LANG-1252
> URL: https://issues.apache.org/jira/browse/LANG-1252
> Project: Commons Lang
> Issue Type: Bug
> Components: lang.math.*
> Affects Versions: 3.4
> Reporter: Rob Tompkins
> Fix For: Discussion
>
>
> In considering the issues LANG-1060, LANG-1040, LANG-1038, and LANG-992, it
> seems that there are times when {{NumberUtils.isNumber}} resolves to
> {{false}} while {{NumberUtils.createNumber}}, given the same input, does not
> throw an exception, returning a valid {{java.lang.Number}}. This
> inconsistency should be resolved either by making {{isNumber}} more lenient
> or {{createNumber}} more stringent.
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