Hi,
I intend to upgrade a Perl codebase which is written in Perl 5.16.3 version for Linux platform. What most important things and factors have to be considered while upgrading it to Perl version 5.40.0? I mean the legacy code should be upgraded with original logic intact. The Perl codes base is about database integration of ecommerce website and is to be hosted on AWS server live. Are there any major differences in Perl syntax of older version?