I think I see the problem here. The code

  #declare V = 0.1;
  #declare Myfunction = function (V) {V*2}
  sphere {x, V}

is internally transformed into something like

  #declare Myfunction = function (0.1) {0.1*2}
  sphere {x, 0.1}

But why can't the parser transform it into something like this instead?

  #declare Myfunction = function (Myfunction_V) {Myfunction_V*2}
  sphere {x, 0.1}

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