Pugs and Elf currently numify a Pair object to 2, and Rakudo currently
dies of despair.

My guess is that the semantics of Pugs and Elf falls out naturally
form a pair being treated as a list of two elements, or something. The
question still deserves to be raised whether always-2 is a good
semantics, or whether one would prefer some other default.

// Carl

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