How Can I Prepare for Perl 7?

• Follow best practices

• If you've been following best practices for the past 15 years, 99% of your upgrade problems are already solved

  • use strict;

  • use warnings;

  • Avoid indirect object syntax

  • Don't depend on hash keys being returned in a predictable order (security bug fixed in 5.18 (2013))

  • Don't depend on presence of . in @INC (security bug fixed in 5.28 (2018)).