You can already document your intent

    my $bork = Bork->new();
    my Chef $x = $bork->bork->bork;
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Only trouble is (gee whizz!) I'm dreaming my life away.

Ahem, back at the plot, the trouble is that perl will silently ignore your careful predeclaration and assign to $x even if ! $bork->bork->bork->isa('Chef'), which is a shame. use strict 'declarations' anyone? Implementation left as an exercise to the interested reader obviously. Me and C don't get on.