I was also trying to minimize the processing of vectors, and executed the
following:

#declare f_Axis = function (Vector) {select (Vector, x, y, z)}

Which worked, but did not give me the expected results.
My debug statements with str complained that it expected a value, but a vector
was encountered instead, which leads me to believe that it was returning the
_vector_ quantities x, y, and z - which I thought functions couldn't do?

modifying/correcting to:

#declare f_Axis = function (x, y, z, Vector) {select (Vector, x, y, z)}

yielded the expected scalar world-coordinate, so that's an interesting pair of
results.

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