Thanks for putting into words one of Perl's most special traits. A "mutant skill" of Perl.

One of my favorites:

package Foo;

# Some kind of just-in-time configuration happens here...
sub init {
  push @INC, '/my/module/dir';
}
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Elsewhere...

package Bar;

use Foo;
BEGIN { Foo->init }
use Baz; # Resides under /my/module/dir
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