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Most languages have had breaking changes at some point in their history. Even the language known as "Perl 5" had them in almost every version.


In the real world, I've found Perl scripts written in 1999 (and poorly - as they were written by me in my teens) will still run in 2019. It's basically the policy that even language mistakes won't be undone:

https://perldoc.perl.org/perlpolicy.html#BACKWARD-COMPATIBIL...




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