Nice idea, but that wouldn't actually override functions in the main package, would it? E.g.

package MainOne;
sub foo { ...}

package NewPlugin;
unshift @MainOne::ISA, __PACKAGE__;

sub foo { warn "new plugin!" ... }
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Now calls to MainOne::Foo would still go to MainOne itself, right? You could provide new functions with this idea, but not override existing ones.

dave hj~