"Boolean Cast Operator" would be a less cryptic name than "Highlander Operator" for !!.
It's not even correct to say it returns 1. For example, print "[", !!1, "]" prints . For a true argument, !! returns the dualvar 1/''.
Update: I got it backwards. True = dualvar (PVNV) 1/'1', False = dualvar (PVNV) 0/''.
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