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imagine combine range with a cute switch
(please please can we have a switch instead of elseif ... please please)

switch y
    case  ]x,z[  :   -- doit
    end
    case [x,z] :
    end
    case {1,2,3,f(4)}:  -- in {}
    end
    case !{1,2,3} and ]x,z[  :  --not in {} but in ]'[
    end
end

:o)