OK, can someone tell me why this generates a parse error:

#declare Spline = spline {cubic_spline
                           -2/13, <-1,0,0>
                          -1/13, <0,0,0>
                          0,     <1,0,0>
                          1/13,  <5,0,0>
                          2/13, <8,0,0>
                          }

While this doesn't:

#declare Spline = spline {cubic_spline
                          -2/13, <-1,0,0>
                          (-1/13), <0,0,0>
                          0,     <1,0,0>
                          1/13,  <5,0,0>
                          2/13, <8,0,0>
                          }

The only difference between these two bits of code is the brackets
around -1/13.

I'm hopelessly confused as to why the brackets are necessary on that one
line, and that one line alone.

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