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Summary of Changes
I'm currently checking our codebase for validity against PHP 7.2 and there are a few things which have come up. One of them is that the mcrypt library has been removed in PHP 7.2.0 completely.
https://www.php.net/manual/en/function.mcrypt-get-iv-size.php
This library does not exist for any version of PHP that Joomla supports and thus this class has not been possible to be used with MCrypt instead of OpenSSL. Since that means no one has been using this, we can remove this now without having to wait until 5.0.