Personally I'd do something like this in the Thing package:

use constant DEBUG => main->can("DEBUG") && main->DEBUG;

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This makes your Thing package more re-usable, allowing it to be used in scripts that don't define a DEBUG constant in the main package.

package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

In reply to Re: Accessing DEBUG constant from sub-package by tobyink
in thread Accessing DEBUG constant from sub-package by Anonymous Monk

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