There are several ways to do that. Here are two more.
my ($foo, $bar, $baz) = map "default", 1..3;
$_="default" for my ($foo, $bar, $baz);
As obscure as the last one is, I'd prefer it over the others if you think that the variable list will expand since you don't have to synchronize the number of variables with a hard-coded constant.
That is, if I wanted to achieve this effect. Which I never have needed to.
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