in reply to variable declaration question

None.

If you're declaring and assigning multiple variables at the same time, the version with the parentheses is more useful...

my ($one, $two, $three) = 1 .. 3;

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perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

In Section Seekers of Perl Wisdom