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Its about const correctness, which is a good idea especially for API or core Code. https://isocpp.org/wiki/faq/const-correctness#overview-const
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> sr-dev <sr-dev-bounces@lists.kamailio.org> on behalf of Daniel-Constantin Mierla <notifications@github.com><br>
<b>Sent:</b> Friday, May 20, 2022 2:32:08 PM<br>
<b>To:</b> Kamailio Devel List <sr-dev@lists.sip-router.org><br>
<b>Cc:</b> Subscribed <subscribed@noreply.github.com><br>
<b>Subject:</b> Re: [sr-dev] [kamailio/kamailio] core: const correctness (PR #3120)</font>
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<p dir="auto">Can you provide more details why these changes are useful or necessary?</p>
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