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https://issues.apache.org/jira/browse/LOG4J2-1329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15232416#comment-15232416
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Mikael Ståldal commented on LOG4J2-1329:
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It is done now, in branch LOG4J2-1356
> API change: let Message.getFormattedMessage() return CharSequence instead of
> String
> -----------------------------------------------------------------------------------
>
> Key: LOG4J2-1329
> URL: https://issues.apache.org/jira/browse/LOG4J2-1329
> Project: Log4j 2
> Issue Type: Improvement
> Components: API
> Affects Versions: 2.5
> Reporter: Remko Popma
>
> I propose that we change {{Message.getFormattedMessage()}} to return a
> {{CharSequence}} instead of a String.
> I believe this change would be backwards compatible (all Message
> implementations that return a String will work as is), and it opens the way
> for zero-GC Message implementations to return a cached StringBuilder as
> Mikael [suggested on the log4j-dev mailing
> list|http://mail-archives.apache.org/mod_mbox/logging-log4j-dev/201603.mbox/%3CCAAFrFhSs4EqjOERwHObKAZP4wjGWeiCET1nyE1FVndYdePk2yw%40mail.gmail.com%3E].
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