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Barry Schwartz committed 98f3a9f

Remove bezderiv for a zeroth-order bezier. Does such a deriv. make any sense?

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fontdesign/bezier.pure

 end;
 
 // Return the value of the derivative of a bezier at time t.
-bezderiv [_] _ = 0;
 bezderiv ctrlpoints t = n * du
 when
   n = #ctrlpoints - 1;