it is just the order of the parameters, the interpolation parameter is the first pin on the fuse node, whereas it is the last one in the code. so, always check parameter names…
also, @everyoneishappy@texone@dottore why did you change the order? In VL the Lerp node, for example, also has the interpolation parameter as the last input… This is the common convention in most languages. it was just vvvv beta that did it that way, to be similar to a switch node…
I think someone probably changed it to try to match the Design Guidelines actually ;). I agree though, particularly in the case of intrinsic functions it should follow the HLSL order.