As for "incompatible" changes, the next/new/improved/whatever Perl should just go ahead and activate strict (and warnings?) by default. Besides improving overall code quality, it would probably reduce the number of SoPW questions. It would also make Perl easier to learn since it removes a lot of silent pitfalls.
perl -e 'use MIME::Base64; print decode_base64("4pmsIE5ldmVyIGdvbm5hIGdpdmUgeW91IHVwCiAgTmV2ZXIgZ29ubmEgbGV0IHlvdSBkb3duLi4uIOKZqwo=");'
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