Nice!
Here a generic - albeit slower - solution for definedness
use strict;
use warnings;
use Data::Dump qw/pp dd/;
#my $scale =42;
#our $scale =42;
sub var {
eval $_[0];# or die $@;
}
my $myscale = var('$scale') // 1;
pp $myscale;
and inspecting the errorstring in $@ can help checking for existence instead.
Global symbol "$scale" requires explicit package name (did you forget to declare "my $scale"?) at (eval 1) line 1.
update
of course using eval directly is shorter
use strict;
use warnings;
#my $scale =42;
#our $scale =42;
my $myscale = eval('$scale') // 1;
print $myscale;
but I prefer encapsulating such magic to be able to capture side effects like polluting $@ or potential injections by tainted input.
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