Perl v5.36 new features

These items are in Perl New Features, a book from Perl School that you can buy on LeanPub or Amazon. Your support helps me to produce more content.

• Unicode 14
• use v5.36 now disables indirect and multidimensional
• switch removed from v5.36 feature bundle
• Pure booleans
• use v5.36 enables warnings
• More paired delimiters
• finally blocks
• subroutine signatures are no longer experimental
• @_ is now experimental within signatured subs
• The isa operator is no longer experimental
• the -g command-line flag is a shortcut for -0777
• experimental iteration of multiple values
• defer blocks