sorry, i don't have alot of experience with packages and namespaces in perl so i could be way off or just offering bad advice, but couldn't you just declare whatever you want to share as a package-level variable and then access it by its full-qualified name in other modules?

#!perl -l

use strict;
use warnings;

package Pizza;
$Pizza::foo = "bar";

package Pizza::Milkshake;
print $Pizza::foo;
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any enlightment on whether or not this The Wrong Way(tm) are welcome.