> And then slurping starts hurting :-)

++ for linguistic excellency but not for correctness. ;-)

Some remarks:

• you don't need a sub missing() just compare with eq
• if you really need it make it a private sub with my $missing = sub {...}
• since constants are implemented as subs, they'll be methods too °
• slurping @vals can still handle both cases by checking the length

Anyway, you seem to be very convinced, so good luck and enjoy! :)

°) maybe consider namespace::clean

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