That's the theory, but for practical reasons (not giving Jonathan a thundering apoplexy, for instance), parameters are currently restricted to a single constraint in front, and will continue to be restricted until we get more experience with the sorting of multiple dispatch candidates using multiple constraints. See the
note in S12, "Multiple constraints".
in reply to Re^4: Reflections on “Higher Order Perl” §1.1
in thread Reflections on “Higher Order Perl” §1.1